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Your cart is empty.Package of four (4) 1/4-28 Threaded Drill Bits in sizes: #40, #30, #21, and #12. Cobalt steel with black oxide finish.
Danielle M.
2025-08-17 15:45:24
Good quality for the price 👌
James T. Jones
2025-07-20 11:43:31
I only got these drill bits because I was lucky enough to get a drill that uses these bits at an auction. I just wanted to get a sample set of bits for the day I need to use these bits in tight quarters. I've kept your address in case I need to order other sizes.
mjh999
2025-06-06 13:38:32
The number 40 bit broke on the first hole, but I have to take credit for the assist rather than totally blaming the bit. It is used in a 90 degree drill attachment, and when it drilled through the 1/8" aluminum, instead of maintaining speed and pulling it out, I let the drill slow and didn't hold enough pressure on the 90 degree drill attachment so it twisted and snapped the bit.I've been drilling a large number of holes with a normal number 40 bit and it flexes without breaking, so yes, I feel the bit isn't very strong. It wasn't as sharp as my other bits were either, and took about 10 minutes to drill through 1/8" aluminum.Being more careful with the #30 and #20, I've managed to keep them from twisting and they haven't broken yet.
robert g thomas
2025-06-04 14:59:02
Worked well on sheet aluminum.
Greg Sharp
2025-03-22 12:22:48
Expected the long version of these bits, as shown in the picture, but received the normal (short) version. This isn't a matter of preference, the tool requires the long version.
chuck
2024-12-21 10:55:31
the order meet my expectations.
James E Ducoing
2024-12-19 18:22:11
These drill bits saved time and effort constructing an RV-4 homebuilt aircraft. Thanks
charles blatchley
2024-12-17 15:58:30
Broke all four very easily, might as well be made out of copper very cheap and soft bits. Don't buy.
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