The MILWAUKEE SHOCKWAVE Impact Duty 4 3/16 - 7/8-Inch Step Bits are engineered to deliver the most durable and fastest impact step bit hole drilling solution. The step drill bits are made in the USA with global materials and deliver best-in-class performance in impact drivers with the versatility to be used in drills. The hex shank has an optimized SHOCKZONE body providing the industrys most durable shank, reducing early shank breaks. A Titanium Aluminum Nitride (TiAlN) coating delivers 5x longer life, while the step drill bit's Rapid Strike TIP and dual spiral flute produce 2x faster holes. The 3/16 - 7/8-Inch step bit features 12 steps with laser engraving for a clear stop on size identification.