Manufactured from high grade fully-chromed vanadium, aluminium free and with a high polish mirror finish, this socket set is ideal for providing a comprehensive socket set for multiple, varied applications. Each socket has a Side-Drive bi-hexagon design that reduces stress/damage to fasteners. The spark plug sockets have rubber inserts and external hex drives: M10 = 16mm & M14 = 21mm. Supplied in fitted blow moulded plastic case. Each piece has a 1/2in. square drive and the set possesses metric, AF and Whitworth sized pieces. Features and Benefits Unique Side-Drive design allows for more torque to be applied and easier turning than conventional sockets Each socket is manufactured from chrome vanadium steel for optimum durability Bi-hexagon sockets are designed to reduce stress and damage to fasteners Sockets are chrome plated, with a high polish mirror finish and an aluminium free, non-sparking design for protection against corrosion Carry case is complete with two locking clasp