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Drill America GLBCOX6M M x 6" Cobalt Aircraft Extension Drill Bit, GLBCO Series

4.6 4.6 out of 5 stars 1,195 ratings

6" Length
Material Cobalt
Cutting Diameter 0.3 Inches
Finish Type Gold Oxide
Shank Type Round
Cutting Angle String 118 Degrees

About this item

  • Effective in drilling tough, high tensile strength materials like stainless steel, inconel and titanium
  • 135° split point tip prevents drill from walking
  • Round shanks allow use with a wide variety of tool holding systems
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools
  • 6" overall length for drilling where extra length for reach is required

Product details

  • Product Dimensions ‏ : ‎ 6 x 4 x 2 inches; 1.13 ounces
  • Date First Available ‏ : ‎ September 30, 2019
  • Manufacturer ‏ : ‎ Qualtech
  • ASIN ‏ : ‎ B07G4D5L5Q
  • Customer Reviews:
    4.6 4.6 out of 5 stars 1,195 ratings

Product Description

Drill America Cobalt Aircraft Extension Drills are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools. Drill America Aircraft Extension Drills are manufactured to National Aerospace Standard 907. The 135° split point is self-centering and reduces thrust. Sizes smaller than 1/16 in. have the 118° standard point. Drill America Aircraft Extension Drills are available in 6 in. and 12 in. overall lengths when extra reach is required.


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    Customer reviews

    4.6 out of 5 stars
    1,195 global ratings

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    Customers say

    Customers find the drill bit functional and sharp. It works well for them, especially in unique custom projects like drilling through tile and thick walls. They appreciate its good price and value for money. However, some customers have differing opinions on its quality and durability.

    AI-generated from the text of customer reviews

    53 customers mention "Functionality"53 positive0 negative

    Customers like the drill bits. They say the bits work well, are coated, and last longer than other ones. Some mention it worked great for a unique custom project and did an outstanding job on 3 blocks in a row without any wear. Overall, customers find the drill bits to be a good product and a great price.

    "Appears to be a good product and it should work well." Read more

    "...to drill several deep pilot holes in a large project and it worked great every time. No warping, stayed sharp and locks into drill easily...." Read more

    "...This is a coated drill bit and worked great good quality." Read more

    "Worked great! I ordered the 1/2in bit and it burrowed into Corten steel without a problem...." Read more

    24 customers mention "Drill bit quality"24 positive0 negative

    Customers appreciate the drill bit quality. They say it cuts fast and stays sharp, making it a good tool for drilling guitar bodies, bathroom tile, and thick walls. The 6" length allows them to drill as deep as needed and screw easily.

    "...No warping, stayed sharp and locks into drill easily. Great product." Read more

    "Good for deep hole" Read more

    "good quality, was able to drill holes in sheet metal" Read more

    "can be used as a masonry drill stop for big yellow." Read more

    16 customers mention "Value for money"16 positive0 negative

    Customers appreciate the drill bits' good price.

    "...that'll help keep it sharp rattling around in my tool chest, and fairly priced...." Read more

    "...Really happy with the purchase, price and even the case it came in. Should be almost a lifetime tool the way it is working so far." Read more

    "...I rated it highly in 'value for money' because the price was far, and away, better than anything I could find in my global search." Read more

    "...I was very impressed and the price was reasonable." Read more

    15 customers mention "Sharpness"15 positive0 negative

    Customers appreciate the drill bit's sharpness. They find it stays sharp for a long time, cuts through metal easily, and cuts fast.

    "...Glad they had it. Good quality, and used it a lot, still sharp." Read more

    "...No warping, stayed sharp and locks into drill easily. Great product." Read more

    "...It's nicely finished, plenty sharp for drilling wood, well packaged in a re-useable case that'll help keep it sharp rattling around in my tool chest..." Read more

    "...It cuts like butter and lasts a very long time. Makes the job much less frustrating as it stays sharp for quite some time" Read more

    39 customers mention "Quality"26 positive13 negative

    Customers have mixed opinions about the drill bits. Some say they are good quality, strong, and last longer than other ones. Others mention that they are fragile, break easily, and lack consistent quality.

    "Can’t find these locally for that size. Glad they had it. Good quality, and used it a lot, still sharp." Read more

    "...It's nicely finished, plenty sharp for drilling wood, well packaged in a re-useable case that'll help keep it sharp rattling around in my tool chest..." Read more

    "The first one broke within seconds of use. The subsequent one drilled multiple holes." Read more

    "...It cuts like butter and lasts a very long time. Makes the job much less frustrating as it stays sharp for quite some time" Read more

    17 customers mention "Durability"10 positive7 negative

    Customers have different views on the drill bit's durability. Some say it lasts a long time, rips through wood easily, and doesn't bend. Others report that it broke within 30 minutes of use.

    "...No warping, stayed sharp and locks into drill easily. Great product." Read more

    "...Other than the initial break, there were no issues with the quality of the bit." Read more

    "...for my needs, after sharpness, was stiffness, and this drill didn't bend at all. Can't speak to its longevity but it's a good product for my needs." Read more

    "...Drilled three holes in 4x4 pressure treated post and the drill snapped in half ...." Read more

    Great quality, Impressed
    5 out of 5 stars
    Great quality, Impressed
    Awesome drill bit. Had to attach strap hinges with carriage bolts for my shed doors. Had to drill in stud walls. Hit some framing nails and this bit cut thru like butter. Very impressive.
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    Top reviews from the United States

    • Reviewed in the United States on November 13, 2024
      Size: 7/32" (Pack of 1)Style: 12" LengthVerified Purchase
      Can’t find these locally for that size. Glad they had it. Good quality, and used it a lot, still sharp.
    • Reviewed in the United States on September 7, 2024
      Size: 7/32" (Pack of 1)Style: 12" LengthVerified Purchase
      Appears to be a good product and it should work well.
    • Reviewed in the United States on March 19, 2024
      Size: 5/16" (Pack of 1)Style: 6" LengthVerified Purchase
      Used to this to drill several deep pilot holes in a large project and it worked great every time. No warping, stayed sharp and locks into drill easily. Great product.
    • Reviewed in the United States on May 18, 2024
      Size: 15/64" (Pack of 1)Style: 12" LengthVerified Purchase
      I bought this for a specific project so I factored the price of the drill into the cost of the repair. It's nicely finished, plenty sharp for drilling wood, well packaged in a re-useable case that'll help keep it sharp rattling around in my tool chest, and fairly priced. Most important for my needs, after sharpness, was stiffness, and this drill didn't bend at all. Can't speak to its longevity but it's a good product for my needs.
    • Reviewed in the United States on October 29, 2024
      Size: 7/32" (Pack of 1)Style: 12" LengthVerified Purchase
      I special ordered these to install down spouts for a gutter system. These things went through 2 layers of stamped 22 GA steel and went through 1/2 plate steel. I used them to drill pilot holes for grade 3 Stainless steel tech screws. The screws kept burning out these bits saved the day!
    • Reviewed in the United States on September 9, 2024
      Size: #1 (Pack of 1)Style: 12" LengthVerified Purchase
      I use these for attaching hidden fasteners to Insulated Metal Panel walls. (5" thick insulated panels that attach with long bolts to a steel building skeleton.) You can get multiple jobs done with the same bit if you know how to drill steel without using any lubricant. It cuts like butter and lasts a very long time. Makes the job much less frustrating as it stays sharp for quite some time
    • Reviewed in the United States on September 28, 2024
      Size: 1/4" (Pack of 1)Style: 12" LengthVerified Purchase
      I needed to drill a broken bolt in the catalytic converter on my car. It was in a difficult spot so I had to use a long drill bit. This was perfect for two bolts that I had to drill. The bit still looks like new. The bolts I drilled were not hardened steel.
    • Reviewed in the United States on November 2, 2024
      Size: 11/64" (Pack of 1)Style: 12" LengthVerified Purchase
      Sharp