SHOCKWAVE Impact Duty 55-Piece Impact Drill and Driver Bit Set, Alloy Steel, Engineered Most Durable and Best Fitting Driver Bits, Wear Guard Tip for Increased Wear Resistance, Precise-Fit Custom Machined Tips, Optimized Shockzone, Includes Impact Driver Bits and Drill Bits for Comprehensive Coverage, Compatible with Impact Drivers and Drill Drivers.