Professional Brushless Rock Tumbler – Quiet 2.5LB Rotary Rock Polisher for Hobbyists & Collectors with High-Performance Motor, Adjustable Speed, Timer, Memory Function & Full Accessories Included
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Availability:
In Stock.
Arrives
Tuesday, Jul 28
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Color: Blue Border
Features
- The Original Brushless Rock Tumbler Pioneered By KomeStone KomeStone brought brushless motor technology to rock tumblers first the K1 Pro is where it started. The professional-grade brushless motor delivers 20,000+ hours of operation, 3X longer lifespan than traditional brushed motors, with less heat, less vibration, and quieter performance from day one.
- Professional-Grade Controls Smart LCD, 9-Day Timer & Memory Function Features a smart LCD display, 9-day programmable timer with automatic shutoff, 3-speed precision controls, and a memory function that resumes your cycle after any power interruption. Military-grade thickened rubber barrel adds extra durability and noise reduction built for professional hobbyists and serious collectors who demand more from every batch.
- 2.5LB Large Capacity Polish More, Faster The extra-large 2.5LB rubber barrel lets you polish 2.5 more rocks per batch than standard 1LB tumblers. Ideal for dedicated collectors and gem enthusiasts processing precious agates, premium jasper, crystals, rough gemstones, or sea glass. The smoother brushless rotation helps protect delicate materials while maximizing polishing consistency and batch efficiency.
- Complete Pro Kit Everything Included For Day One Includes the K1 Pro tumbler, 2.5LB rubber barrel, 1LB rough rocks (9 types), 4 polishing grits, ceramic media, sifter, jewelry fastenings, 2 extra belts, and a full-color illustrated guidebook. Unbox, load, and start your first professional-grade polishing cycle immediately.
- Advanced 4-Stage System + Pro Polishing Techniques gem-quality shine Includes a complete Advanced 4-Stage Grit System (60/) with precision ceramic media and a leak-proof stainless-steel lid. Our exclusive Pro Polishing Techniques guidebook covers advanced methods to help you achieve gem-quality shine from every batch.
- Easy Maintenance User-Replaceable Drive Belt Combined with our brushless motor, this user-replaceable belt system keeps your professional station running at peak performance year after year. Designed for hobbyists and collectors who want reliable long-term performance from every polishing cycle.
- 90-Day Money-Back Guarantee & 1-Year Warranty: Risk-Free Purchase Your K1 Pro is backed by a 90-day satisfaction guarantee and a 1-year warranty. Our US-based customer service team provides 24/7 hassle-free replacement or refund support shop with complete confidence.
Brand Name: KomeStone
Age Range Description: 13 years and up
Educational Objective: Creative Skills
Set Name: K1 Pro
Manufacturer Maximum Age (MONTHS): 1200.0
Manufacturer Minimum Age (MONTHS): 156.0
Model Number: K1 Pro
Manufacturer Part Number: CA-KS0613RT14
Manufacturer: KomeStone
Item Type Name: Rock Tumbler
Unit Count: 1.0 Count
Manufacturer Warranty Description: 2-Year Warranty for free exchange against manufacturing defects
Included Components: 1 pound of rocks & 4 bages of polishing grits & ceramic pellets, 1 rock tumbler base & 1 rubber barresl, 2 PU belts & user instructions, jewelry fastenings & adaptor & screwdriver & mesh strainer
Theme: Geology
Battery Description: No batteries required
Is Assembly Required: No
Material Type: Brushless motor, Top quality of stainless steel, Tyre grade rubber, 𝐂𝐏𝐒𝐈𝐀 & 𝐂𝐏𝐂 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝
Size: 11.3 x 9.17 x 5.87 inches
Item Dimensions: 11.22 x 9.02 x 5.17 inches
Item Weight: 2.5 Pounds
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jul 28
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Black
I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.
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Reviewed in the United States on October 27, 2025 by Zero Signal
Color: Blue Border
Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!
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Reviewed in the United States on July 16, 2025 by KJo
Color: Black
Ordered this about 3 months ago. Finished my first batch of all 4 steps this week. The pictures above show the results of my first attempt. I got some rocks with a really great shine. Many of the rocks I tumbled had white edges even though the face was smooth and shiny. Looking closely, the edges appear to have micro-pitting which I expect means I didn't provide enough cushion in the tumbler. I am very happy with my initial results, but it is clear that to get excellent results will require further experimentation. The tumbler worked without issue. I filled it about halfway and added the grit package and water. Some of the reviews indicated issues with the belt, but I didn't experience any issues with the actual tumbler, belt, or stand. I noticed that on speed 3, the stand did tend to vibrate around. I recommend two sided adhesive to keep it firmly in place. The tumbler didn't leak at all. The instructions were great! Provided guidelines for each step. The pictures of the rocks included as a samples were very nice. Also provided suggestions for some additional ingredients to experiment with. One suggestion is to in between each step after rinsing the rocks, add some dish soap and water and turn on speed 1 for 1-2 hours. This does a great job of cleaning the rocks in between the steps. This also helps after the polish to get a shinier polish. Inside the kit was a bonus gift if you contacted the support group. I did contact the support group and found them very responsive. They did send me 5 additional belts, although I have not yet needed to replace the original. Overall, the product seems high quality and able to last for many years of tumbling. Responsive support is available for the product if there are problems. The final results of the tumbling process can be very nice, but it is clear that the quality of the results rely upon the experience of the operator, rocks selected to tumble, ingredients to tumble in, and time and speed of the tumbler.
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Reviewed in the United States on October 17, 2023 Reviewed in the United States on October 17, 2023 by Michael Hachigian
Color: Blue Border
I’ve run this tumbler nonstop 24/7 for just over a year. It’s still going, though the lid seal and rollers are worn. Pros: Easy to load, countdown timer, pause button, durable barrel, brushless motor holds up well, fairly quiet, compact, no leaks, and low energy use. Cons: Even on the lowest speed it’s too fast for anything beyond shaping rough rocks and can bruise softer ones (even with ceramic media). You can’t slow it down enough for later stages without changing pulleys. Doesn’t restart automatically after a power outage, and belts wear quicker than I’d like. If you haven’t heard it enough already, the polish that is provided will NOT give you the high polished shine. Overall: Excellent for rough stage one rocks. Once the rough edges are knocked off I move the rocks to a slower tumbler to finish stage one and beyond. It’s a reliable workhorse, though I’ll get the standard motor next time since it’s easier to adjust the speed.
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Reviewed in the United States on September 21, 2025 by Dougie B
Color: Black
This is a great little rock tumbler! I have run quite a few batches through this thing and it's always fun to see the shiny results after the last grit. So far it works as it should for me with no issues!
Reviewed in the United States on April 30, 2026 by Andy
Color: Black
The tumbler was exactly what I was hoping for to have fun tumbling the stones that my son and I mine together. The stones that came with the tumbler were very nice as well. The instructions were very clear and easy to follow, along with the equipment actually being easy, but seemingly good quality. The drum seems well designed with good durability, I have not had any leaks. For some reason, the tumbler base malfunctioned after about 2 weeks of use, where the motor stopped working. I reached out to the manufacturer and I'm not exaggerating when I say they were top notch in their response. The reply was very fast, with clear questions and instructions on what they needed from me. I was busy for a few days and took some time to send them my info, and they checked up to make sure I didn't need any help getting it to them. They shipped a new base within 24 hours and it arrived next day shipping. Once I received it, they were very concerned to make sure I received it, the new one was working properly, and I was 100% satisfied with how they resolved the issue. They sent me an email every few days to ensure I didn't have any issues until I got back with them (I wanted to let it run for a week cycle to make sure it was good to go). In addition to the new base, they issued me an additional one year warranty on the replacement. I'm not typically one to go into in depth reviews, but they honestly deserve it, even just for the amazing and friendly customer service, then a very nice tumbler for hobby use. I was already debating possibly upgrading to the larger one in a few months, and I am sold on it now.I will be buying my extra grit from them after this experience, instead of browsing for other sellers. I know that if I'm not satisfied, they will go above and beyond to change that.
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Reviewed in the United States on October 13, 2025 by Brandon
Color: Blue Border
Seeing a LOT of complaints from the past two months about motors failing. Guess what? Mine stopped working today, have only had it since December. It ran strong for those two months, then today after I took off a batch of tumbles, when I went to put a new batch in, it doesn't tumble. Display lights up but the motor is cooked. I Emailed their "24/7" customer support" so I'm hoping I actually get a reply. Sounds like Komestone needs to provide better, durable motors if it wants to stay in business, because this is clearly a chronic issue, and this is supposed to be the "upgraded, Professional" model. UPDATE 02/26/2026 - I initially didn't get a reply from Komestone support when I Emailed them, but I suspect it got filtered and never made it to anyone. I used the "request a free gift" QR code and through that I got a fast reply from customer service, where I was able to explain my situation. The rep was very friendly and helpful and arranged a brand new K1 Pro to be shipped to me at no cost, since it was within the warranty period but outside of Amazon's return window. I got the new unit today and confirmed everything is working, so I've revised my review to five stars since the company is making an honest effort to uphold their warranty. Hopefully this new one will last longer. UPDATE #2 03/09/2026: The replacement unit died on me after one full tumbling cycle and a few days on the next. The motor STRUGGLES with any kind of load on the tumbler, even an empty barrel, and only starts spinning the barrel for a few seconds at best before it locks up. The "cutting-edge" motors they are using in this unit are trash. I moved the loaded barrel over to a different brand tumbler base that is rated for a lighter load and it's tumbling it just fine. This is ridiculous. UPDATE #3: The saga continues. KomeStone support sent me new motors which appear to be from a newer production run, so here's hoping they don't suffer the same fates as the previous ones.
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Reviewed in the United States on February 7, 2026 by Kim
Color: Black
The rock tumbler came with everything listed in the product description, and all the parts arrived in good condition. The setup process was straightforward and easy to follow, making it simple to get started right away. I'm excited to see the final results. Based on the estimated tumbling time, it will be about a month before the process is complete, but my initial impression is very positive. So far, everything is working as expected, and I'm looking forward to seeing how the rocks turn out. I'll update my review once the tumbling process is finished.
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Reviewed in the United States on June 7, 2026 Reviewed in the United States on June 7, 2026 by EDS