This is a new in the package, set of 10 Magnetic Nut Setters. You will receive five SAE (1/4", 5/16", 3/8", 7/16" and 1/2") and five MM (6, 7, 8, 10, and 12 mm). They have 1/4" shanks, and fit most all cordless or corded drills, and screw guns also.

These bits are sand-blasted and heat treated, as well as being Chrome Vanadium steel.

These are excellent nut setters. I've used them myself putting in various sizes of self-tapping/drilling screws.