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Specifications:
21PCS COBALT DRILL BIT SET 1/16,5/64,3/32,7/64,1/8,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,17/64,9/32,19/64,5/16,21/64,11/32,32/64,3/8 with triangle shank.
Product Feature:
Material:HSS M35 (COBALT 5%)
Angle Point: 135 Degree with Golden Ratio Tip.
Shank Type: Triangle Shank
Hardness: 63-64 Rockwell
Application: widely used for hevery industry purpose in hard stainless still or any hard metal.
Instructions: Simply insert drills to chucks or power tools,suggest RPM:500R/M
Precautions: Make sure to put on masks and gloves before drilling.
Keep cool or discontinuous use will largely prolong drill life.
High performace and reliable quality to be promised by INTOO!
LUIS CARLOS ARISTIZABAL
Reviewed in the United States on February 16, 2023
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Lee R.
Reviewed in the United States on November 5, 2023
Drill bits are great and sharp work extremely well
AR
Reviewed in the United States on November 23, 2023
Bought this as a surprise gift for my husband. He absolutely loves it and hasn’t complained about it so far!
Dan Jennings
Reviewed in the United States on January 8, 2023
Drill bits work pretty good. The case came all beat to hell. Opens fine but a pain to close.
R. Smith
Reviewed in the United States on March 26, 2022
I am a mechanical engineer and I know my drill bits. I have some of the most expensive high end drill bits as I do drilling in heavy steel. I tested one of the bits into a thick piece of structural angle iron. The 135 degree bit angle, with a small slot for shedding the nicely developed small chips, is perfect for slower speed precision drilling. The bit had no problem getting through, and a closeup afterwards showed no visible wear. This will be a nice set of drill bits for higher end drilling in hard steel.I would not recommending getting these bits if all you are doing is drilling into wood, plastic and thin mild steel. These bits would be incredible overkill as they are designed for much more difficult industrial applications. You would be wasting your money. However, if you are a doing serious drilling into cold rolled steel or stainless steel, these are essential because of their incredible hardness.Comparing these to a 29 piece set of other M35 cobalt drill bits, I would say you are getting a bargain at this price. I have paid more for a good set.Con: I hate the metal case. It does not have a real hinge, just a piece of bent metal tab in a slot. See my picture. Every time you open and close the case the tab bends. It will break off in a short time.
Danny J Harding
Reviewed in the United States on December 20, 2022
Broke a bolt off in an engine block. My usual drill bits would not drill the center out for using an "easy-out" extractror, so I ordered these and they cut the hardened metal that bolt was made of and I was able to get it out.
Robert Jonas
Reviewed in the United States on June 26, 2021
I have other Titanium Bits, and these are the best. I recently had to drill new holes in a 12" Strap Hinge and other such bits didn't make a dent, but these went trough like Butter.
D Mercer
Reviewed in the United States on December 25, 2020
Cuts great I install police radios and these put Ryobi bits to shame and the shaft isnt round so they dont spin in the chuck!!!
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