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GMTOOLS

GMTOOLS 115Pcs Cobalt Drill Bits Set, M35 High Speed Steel, 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Plastic and Wood with Metal Indexed Storage Case, 1/16"-1/2"

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Availability: 12 left in stock
Fulfilled by Amazon
Arrives Sunday, May 31
Order within 22 hours and 53 minutes
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Style: 115 pcs Cobalt


Features

  • 115 Pieces Set Includes: 29pcs Fractional Size: 1/16 to 1/2 inch bits in 1/64th increments; 26pcs Letter Size: A To Z; 60pcs Numbered Size: #1 To #60; Set includes the drill bit holder with size index for easy storage and organizing
  • Perfect Drill Bits: Precision grinding process for a clean surface and high grinding accuracy. Universal round drill shank, widely applicable of tool holding systems and tightly clamped
  • 135 Split Point & Twist Design: The 135 degree fast cutting point is automatically centered and penetrates quickly with less pressure, reducing walking, fully ground drill bit with sharp and durable cutting edge. Twist design for clear chips faster
  • Enhanced M35 Alloy Material: These drill bits contain 5% Cobalt alloy steel, which increases wear resistance and durability. Industry grade 6542 high speed steel drill bit set, harder than 4241 HSS used in other similar drill bits set
  • QUALITY COMMITMENT: If for any reason you are not satisfied with your purchase, please contact us. We provide 30-day money back. 100% Satisfaction Guarantee for risk-free shopping!

Material: Cobalt Steel


Cutting Diameter: 0.5 Inches


Finish Type: Titanium


Shank Type: Straight


Cutting Angle String: 135 Degrees Degrees


Brand Name: GMTOOLS


Set Name: 115Pcs Cobalt Drill Bits Set


Unit Count: 1.0 Count


Manufacturer: GMTOOLS


Part Number: Cobalt Twist Drill Bit


Number of Pieces: 115


Cutting Diameter: 0.5 Inches


Material Type: Cobalt Steel


Finish Types: Titanium


Shank Type: Straight


Surface Recommendation: Metal


Cutting Angle String: 135 Degrees Degrees


Tool Flute Type: Spiral


Point Style: Split Point


Number of Flutes: 2


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, May 31

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.

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Similar Products

Top Amazon Reviews

    • decent product so far
Style: 29 pcs Black Gold
working well for the few things I've used them for so far. cut quickly and cleanly. nice metal box to keep them in and organized as well.
Reviewed in the United States on February 4, 2026 by Lamar White
    • Nice, inexpensive set of bits
Style: 13 pcs Cobalt
Nice, inexpensive set of drill bits. They're not very long, so make sure you know what you're getting. They're nice to have as replacements for others that I have broken so they fit my need perfectly. I'm not expecting to drill through diamonds with them...
Reviewed in the United States on February 3, 2026 by Tony
    • Good bits, poor quality box.
Style: 115 pcs Cobalt
Bit’s are sharp and appear to hold an edge; I have only used two Bits out of the index and both worked well. Index box is thin and deforms easily, latch is not trustworthy. Good bits, poor quality box.
Reviewed in the United States on June 2, 2025 by Amazon Customer
    • Excellent product.
Style: 15 pcs Cobalt
Worked perfect as advertised.
Reviewed in the United States on March 7, 2026 by Robert Himes
    • Pretty solid an durable
Style: 29 pcs Black Gold
Review Image by Me
Review Image by Me
Well i broke one bit, but for the money they're pretty solid considering im going through cold rolled steel thats a 1/4" thick. Also, if youre going through any solid metal such as steel, dip the bits in oil at the tip to help with the heat
Reviewed in the United States on March 22, 2026 by Me
    • Great for the price
Style: 13 pcs Cobalt
I went through several bits from another set when trying to drill through a metal plate. These went through without breaking and without slipping. Pleased with this purchase.
Reviewed in the United States on March 16, 2026 by be
    • They work great
Style: M35-1/8-10pcs
They work great at a great price
Reviewed in the United States on February 6, 2026 by bainbrigejim
    • Weak Bits
Style: 29 pcs Black Gold
Review Image by KRC
First time I tried to drill a 3/8" hole into a pipe with a cordless drill, the bit snapped in half on me. Not sure if the integrity of these bits can actually handle drilling through metal.
Reviewed in the United States on February 10, 2026 by KRC

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