Work faster and avoid unnecessary disassembly steps with the TEKTON 3-pc. 3/8 in. Drive Impact Extension Set. Engineered for use with impact drivers, they reach past obstructions or into tight, narrow spaces and deliver the torque needed to break loose stubborn fasteners. A spring-loaded detent ball securely latches onto sockets, preventing them from being dropped or left sticking on fasteners. The through-hole in the drive end locks onto the tang of impact wrenches or drivers. To protect against rust and corrosion, the black oxide finish absorbs and holds oil, repelling moisture.