Precision Twist QC91P High Speed Steel Long Length Drill Bit, Uncoated (Bright) Finish, Round Shank, Parabolic Flute, 135 Degree Point Angle, 1 (Pack of 12)
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Thank you for reaching out to us with your query. The overall length of the QC91P (part number 057905) is 3 3/4 inches, with a flute length of 2 inches.
Selected User Reviews For Precision Twist QC91P High Speed Steel Long Length Drill Bit, Uncoated (Bright) Finish, Round Shank, Parabolic Flute, 135 Degree Point Angle, 1 (Pack of 12)
They have holes drilled in them that are 078" in diameter. Each hole measured more than 1/2" in depth. Initially, I pecked away with a standard drill bit, which made the process tedious. Drill bits with "Parabolic" flutes appeared to be an option after reading about how to drill aluminum more efficiently. I'm happy to report that these drill bits revolutionized my job after drilling the last 900 holes with just one drill bit (no more jamming, clogging, or breaking bits)! Thank you so much for helping me finish the rings in such a short amount of time!.
I was able to use it to drill pilot holes, and it performed admirably. I'm not sure how long it'll last if it's used frequently, but it appears to work well for occasional use.