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IRWIN

Irwin Tools IRWIN SPEEDBOR Drill Bit Set for Wood, 4-Inch, 6-Piece (1877239)

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Availability: In Stock.
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Arrives Tuesday, Apr 21
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Features

  • Three cutting spurs for faster, cleaner holes, less breakout and extended drilling life
  • Full screw-point tip allows bit to self-feed for ease of drilling
  • Shorter overall length for drilling in tight spaces. Ideal for holes up to 2" deep
  • 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills

Description

The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills. From the Manufacturer The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout, and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills.

Material: Blend


Cutting Diameter: 101.6 Millimeters


Finish Type: Brushed


Shank Type: Hex


Cutting Angle String: 135 Degrees


Cutting Diameter: 101.6 Millimeters


Item Dimensions: 1.22 x 6.1 x 9.25 inches


Minimum Bore Diameter: 4 Inches


Material Type: Blend


Finish Types: Brushed


Shank Type: Hex


Surface Recommendation: Wood


Cutting Angle String: 135 Degrees


Tool Flute Type: Spiral


Point Style: Screw Point


Number of Flutes: 3


Brand Name: IRWIN


Model: 1877239


UPC: 042526916762


Global Trade Identification Number: 62


Manufacturer: IRWIN


Item Type Name: SPEEDBOR MAX 4IN OAL 6PC CLAM SET


Included Components: (6) Speedbor Max Speed Bits sizes 1/2" ,5/8", 3/4", 7/8", 1" and 1-1/8"


Item Weight: 0.1 Pounds


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Apr 21

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Top Amazon Reviews

    • Worked Perfect, much better than a Paddle Bit!
Size: One Size
Was using one of these within an hour after receiving.....needed to make 8, 1" inch holes in treated 4 x 4's.....not an issue, worked excellent, a paddle bit would've been destroyed, just let the bit feed itself thru the wood. Good buy for me, thank you
Reviewed in the United States on November 20, 2025 by Amazon Customer
    • The only? sensible way to run cable through 2x4 studs
Size: One Size
You could use a spade bit I suppose: push, struggle and take a break after the second one. With these bits you pretty much touch the tip to the wood, trigger the drill and sit back and watch. No push required. The threads on the tip suck the bit through the wood. You'll have time and energy to spare, to wipe off the shavings at the far end. The short bit length, ideally in combination with a right-angle drill or adapter, gets you in even when studs are narrowly spaced. If you're a first-time DIYer I strongly suggest you read up on the electrical code on drilling through studs. Do it wrong and you could cause a fire and/or weaken the stud. ... show more
Reviewed in the United States on November 30, 2025 by Enigmatic Techie
    • Sturdy bits. I used them a lot around the cabin,!
Size: One Size
Good bits!
Reviewed in the United States on February 10, 2026 by Stephen Hannelly
    • Great but avoid hitting screws.
Size: One Size
I recently purchased the Irwin Tools IRWIN SPEEDBOR Drill Bit Set for Wood, 4-Inch, 6-Piece (1877239) and have been quite impressed with its performance. The drill bits are incredibly sharp and make quick work of wood, allowing for smooth and efficient drilling. The set includes a variety of sizes, which is perfect for different projects. However, I did encounter one issue: once you hit a screw, it's all over. The bits don't handle screws well and can get damaged easily. Despite this drawback, the overall quality and performance of the drill bits for wood are excellent. I would recommend this set to anyone who primarily works with wood and can avoid hitting screws. ... show more
Reviewed in the United States on August 20, 2024 by nj28sharp
    • Nice shorties for drilling through 2xs for electrical
Size: One Size
These have always worked well for me and I occasionally wear certain ones out so I but the assortment each time. Im pretty hard on these in that I hot nails and screws which are the kiss of death. There are ones that tolerate hitting metal better but even those aren't meant for hitting heavy guage and structural screws. ... show more
Reviewed in the United States on July 24, 2025 by Adam and Laura
    • These are great bits and the 4" length is great for wiring.
Size: One Size
These 3 wing bits are so much better than spade bits. They're faster, they clear chips much better, and they are much less likely to jam up. They do require a drill with some torque, though. A good 3/8" cordless will run up to 3/4" easily, but I think a 1/2" drill is probably a good idea for 1" bits. If you have a side handle, use it. The 4" length is great, because it's plenty to get through 2x lumber, and it's short enough that many regular drills have plenty of room to drill between 16" studs, so you don't need a right angle. With a right angle drill, it'll get into some tight spots. This isn't a woodworking bit, so it will often/usually not make a pretty exit. It's for construction work. I've run the 6" size on extension to fish in ceilings, and they work great for that. The recesses allow the extension to lock onto the bit, so much less risk of losing it. Much better and faster than extensions that use set screws. ... show more
Reviewed in the United States on May 30, 2022 by Tom
    • good quality bits
Size: One Size
Works way better than the blade type bits.
Reviewed in the United States on October 29, 2025 by Gasman
    • Good bits for drilling in Douglas Fir.
Size: One Size
Good value for someone who is going to use these for drilling rough holes in softwood. I drilled about 100 holes in 3 inch Douglas fir, and the bits are going strong. Be careful because they are aggressive and will put significant amounts of torque on the user if using a high-powered drill. The length of the bits in this particular set is shorter than another similar Irwin Speedbor bit I purchased at the hardware store, but still did the job just as well. In fact some may discover that the shorter length will allow you to get into tighter places. Nothing for me to complain about this set. ... show more
Reviewed in the United States on January 12, 2022 by Rob Avi*****

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