Comes With A Metal Index
These titanium coated high speed steel bits run cooler and last longer than standard drill bits, they penetrate 75% faster, cut more freely so you use less power, and they don't expand with heat, so you get properly sized holes.
29 fractional sizes 1/16'' to 1/2'' by 64ths
26 letter sizes A to Z
60 numbered wire gauge sizes 1 to 60