Milwaukee® SHOCKWAVE™ Impact Duty™ ECX™ Driver Bits are engineered for extreme durability and up to 10x life. ECX™ Driver Bits are a combination of Phillips, Square Recess and Slotted tips designed for superior grip to eliminate rounding out fastener heads. Made from proprietary steel and heat treated to control hardness, the SHOCKWAVE™ Impact Duty™ ECX™ Driver Bits feature an innovatively designed geometric shock absorption zone to extend life. The forged tip allows for a secure grip and maximum contact eliminating stripping or slipping.