Save your knuckles, work faster, and avoid extra disassembly with the TEKTON 1/2 in. Drive x 10 in. Extension. Made of premium chrome vanadium steel, it reaches past obstructions or into tight, narrow spaces, delivering the strength to loosen stubborn fasteners. The spring-loaded detent ball securely latches onto sockets, preventing them from being dropped or left sticking on fasteners. Detent notches in the drive end lock onto the drive tang of ratchets and breaker bars. A mirror chrome finish resists rust and corrosion and wipes clean after each use.