Teng Tools sockets are manufactured from strong chrome vanadium steel in accordance with ISO9000 and AS954. They provide excellent torque, whilst reducing the risk of rounding fasteners. This TENT1221 1/2inch drive 12-point socket set comprises 21 pieces, which are supplied in a plastic case with a latch lock, retractable handle and metal pin hinges. The underside of the case is fitted with rubber feet to prevent it from sliding. This 21-piece set contains the following: 16 x 1/2in Bi-Hex Sockets 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 27, 30 & 32mm.1 x 1/2in Reversible Ratchet.2 x 1/2in Extension Bars: 63 & 150mm.1 x 1/2in Universal Joint.1 x 1/2in T-Bar Adaptor (1/2in Female to 3/8in Male).