13/16" Drill Bits and Drill Bit Sets Grainger ...
Cobalt drill bits tolerate higher drilling speeds and are harder and more wearresistant than highspeed steel drill bits. Also known as Silver and Deming drill bits, these reducedshank drill bits have a 1/2" shank and a drill diameter that is greater than 1/2". They can create larger holes than standard drill bits that have a 1/2" shank.