This Craftsman® Impact Rated™ screwdriving bits kit is designed to screw using an impact driver. Made in S2 modified steel, these bits have a torsion zone that absorbs the impacts and prevent the bit from breaking. They are strong enough to resist wear for many years. The tip is CNC-machined for higher precision and to prevent cam-out. This case contains 22 bits of 1", 6 bits of 2", and a 3" magnetic drive guide.