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This was my second purchase of these center drills, They are not marked M42 or Cobalt but they seem to wear as well as my brand name HSS drills. The one problem is that most of the points are not properly ground (off-center or backward slope). They are useless this way. I have a drill grinder that can resharpen the larger bits. I resharpen the small bits (#1 and 2) by eye. They work well after proper grinding. If you can't accurately sharpen your bits, you should probably spend the money for machinist-quality center drills instead. FYI--if you want to use them as countersinks for screws, buy 82 degree center drills instead.
Verified purchase: Yes | Condition: New
Seems to be a decent set of center drills. Comes in a plastic case. Quick ship.
Verified purchase: Yes | Condition: New
cheep low quality center drill, tips snap off in mild steel. recommended use Al only.;
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Well made . Sharp and cut great. Price super. Shipping is the fastest. I purchased 3 sets. Well buy more when time comes.
Verified purchase: Yes | Condition: New