Standard and Custom Impact Sockets Impact sockets are rugged accessories designed for use with impact tools such as impact wrenches to tighten or loosen nuts and bolts with high torque. Bits, Special Bits, Bit Holders and Accessories Special bits meet the specific needs of demanding industries, with shapes and materials suited to complex or security fasteners. Screwdriving Accessories Screwdriving accessories include a broad range of complementary components that optimize and simplify fastening operations.