Beta Worker 1/4in. BW 956C Spark plug sockets,1/2” female square drive 16 mm (5/8″) – 21 mm (13/16″). BW 900 Hexagon hand sockets, 1/4″ 4-4,5-5-5,5-6-7-8-9-10-11-12-13-14 mm. BW 900L Hexagon hand sockets, long series, 1/4″ 6-7-8-9-10-11-12-13 mm.