Expert Quality, Multi - Drive® ; sockets manufactured from chrome vanadium steel hardened and tempered with a micro satin finish. Each socket has a knurled ring for extra grip. Draper Expert Multi - Drive® ; sockets allow them to be used with metric and imperial hexagon, bi - hexagon, spline and Draper TX - STAR fixings. Packed on a plastic hanging rail that can also be used to store the sockets in a tool box. Contents: 12 x Sockets: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications