Shockwave, 2-7/8", Impact Lock Bit, Auto Locking Design Fit All Inserts & 1/4" Hex Bits, Quick Release Collar, 1 Handed Bit Changes, Dual Magnets Maximize Magnetic Transfer & Holding Power To Fastener, Optimized Shockz 1 Absorbs Peak Torque & Prevents Breaking, Custom Alloy 76 Steel.