Shockwave, 2 Pack, 1", ECX2 Bit Tip Combo Drive, Optimized Shock Zone Geometry Absorbs Peak Torque & Prevents Breaking, Precise Fit Custom Machined Tip Prevents Stripping & Reduces Wobble, Custom Alloy76 Steel Maximizes Resistance To Wear & Shock, Includes: 1" ECX #1 Power Bit & 1" ECX #2 Power Bit, 1/4"" Shank Compatible With Drills & Impact Drivers.