Milwaukee's SHOCKWAVE™ Impact Duty™ Step Bits are engineered to deliver the most durable and fastest impact step bit hole drilling solution. Their step drill bits are made in the USA with global materials and give you best-in-class performance in impact drivers with the versatility to be used in drills. The 1/4" hex shank has an optimized SHOCKZONE™ body providing you with the industry’s most durable shank, reducing early shank breaks.