SHOCKWAVE™ Impact Duty™ 3 Piece Step Bits are engineered to deliver a durable and fast impact step bit hole drilling solution. The ¼" hex shank has an optimized SHOCKZONE™ body providing you with a durable shank, reducing early shank breaks. Titanium Aluminum Nitride (TiAlN) coating helps deliver long bit life, while the bits tip and dual spiral flute produce holes quickly. This step drill bit kit features the #1 1/8 - 1/2", #2 3/16 - 1/2", and #4 3/16 - 7/8" step bits with laser engraving for a clear stop on size identification.