Name: Ratchet Socket Adapter. Size: 1/4, 3/8, 1/2. Material: Chrome Vanadium Steel. Uses: Ratchet Socket Adapter. Features: Complete Specifications, High Hardness, Durability, Long Life, Special for Socket Wrenches, High-quality Materials. 100% brand new and high quality. High quality chrome vanadium steel bushing, durable and long service life. High hardness and high torque, fully comply with ISO/ANSI standards. Adapter for converting the socket into a screwdriver bit.