15 PieceThe ideal drive size for high torque hand applications. Designed to give strength and reliability under heavy loads. Used extensively in heavy plant, rail, shipyard and oil rig industries. Manufactured from hardened chrome vanadium steel, fully chrome plated with a mirror finish and aluminium free to ensure non-sparking. All have ball-retaining groove on each face of the square drive. Sockets Manufactured to ANSI B107.5M: 1987, ANSI B107.1: 1978 & BS 4006: 1992. Accessories Manufactured to: ANSI B107.10M: 1982 & BS 4006: 1992 Contents: 1" Square Drive Metric Sockets: 36, 41, 46, 50, 55, 60, 65, 70, 75, & 80mm. Accessories: Ratchet & sliding 'T' heads, 550mm universal handle, 200 & 400mm extension bars.