Designed for use in conjunction with any 1/4inch hexagon drive unit i.e. hand electric or air screwdrivers to drive 1/4inch and 3/8inch square drive sockets. Comprises 1/4inch hexagon x 1/4inch square and 1/4inch hexagon x 3/8inch square adaptors. Manufactured from chrome vanadium steel hardened tempered and chrome plated. Each square driver end incorporates a spring-loaded retaining ball for secure socket holding. Display packed.