Greycore Tools 1/8 Inch x 6 Inch Cobalt Aircraft Extension Bit – 2 Pack M35 Cobalt Drill Bit, Industrial Titanium Coating – D

4.4 4.4 out of 5 stars | 150 ratings

Price: 7.99

Last update: 02-11-2025


About this item

Includes: 2 – 1/8 Inch x 6 Inch Cobalt Drill Bits
These cobalt drill bits are designed for long lasting durability and performance, ensuring fast and easy penetration through many different materials.
Heavy-Duty Material: Our drill bits for hardened steel feature a heavy-duty construction made with M35 cobalt (5% cobalt) and an industrial strength titanium coating, which provide excellent durability and superior resistance against abrasion and high heat.
Split Point Tip: These cobalt drill bits feature a 135 degree split point tip that prevents slipping and can help increase drilling speed while ensuring smooth and easy penetration.
Compatible Materials: Hard metals, stainless steel, cast iron, steel, titanium alloy, hard plastics, wood and more, and a wide range of applications such as repair, construction, or woodworking.

Top reviews from the United States

  • E. A. Smith
    5.0 out of 5 stars Good, but not precise
    Reviewed in the United States on January 14, 2025
    I used this drill bit to clean out some lengthy wood bores that were poorly drilled overseas. They worked well for that, but do not anticipate doing any precision work with them.
  • Steve L
    5.0 out of 5 stars Nicely made and sharp
    Reviewed in the United States on January 18, 2025
    They're good drill bits. My specific purpose for these is to be able to insert my Combustion Inc. Predictive Thermometer in frozen meat! They are the right diameter and length for this.
  • JJG
    4.0 out of 5 stars Close Enough (this time)
    Reviewed in the United States on December 14, 2024
    I needed a 3/16” drill bit at least 4” long. So, I ordered a Greycore Tools 3/32 Inch x 6 Inch Cobalt Aircraft Extension Bit 2 Pack. What I received instead was a 3/32 Inch x 12 Inch 1 Pack. Clearly not the same thing but it got the job done. It was a good deal on a quality hard-to-find bit size. So, I am keeping it without complaint (this time).
  • Avtomat Kalashni
    5.0 out of 5 stars Good bits for special projects
    Reviewed in the United States on October 14, 2024
    Not a super high quality bit but is is good. Perfect for the limited use special project stuff...steel and aluminum....slow and limited pressure with oil and they do their job! A+
  • Kelly Warren
    5.0 out of 5 stars Good bit
    Reviewed in the United States on January 31, 2025
    Good bit for the price. Would buy again.
  • Adam
    1.0 out of 5 stars Garbage
    Reviewed in the United States on July 4, 2024
    Needed a long cobalt bit to drill 16 holes in mild steel in a weird spot. Went with this one. I drilled one hole in 1/4” mild steel. The bit dulled considerably. On hole #2 the bit broke off. In mild steel. Cordless 1/2” drill. Not exactly extreme conditions. I’m not sure I’ve ever had a bit get dull or break off so easily. Especially one this expensive. Worthless product that does not hold up

    EDIT: I bought dewalt’s cheapo 12” version from a local farm/ranch store. It finished the hole that this one broke on as well as the remaining 14 holes. No sweat. It was also 30% cheaper at $14.99. This all further validates that this is a garbage rip off of a product as I previously stated
  • Good foot soaker
    5.0 out of 5 stars Worked well but…
    Reviewed in the United States on February 1, 2025
    Ordered a pair of 3/32”-6”. Received a single 3/32”-12”. Amazon fulfillment sent me the wrong item. Resolved with customer service the next day but delayed the job. I saw that I was not the only customer that had that happen.
    Used these to drill pilot holes in oak kitchen cabinets for #8-2” wood screws. Functioned well
  • Kat Atwood
    5.0 out of 5 stars As expected
    Reviewed in the United States on January 21, 2025
    Husband bought them. They arrived in a reasonable amount of time. Work as expected.

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