Description • One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. • Chrome Vanadium steel Total Drive® sockets, hardened and heat treated for strength with a fully polished mirror finish for resistance to corrosion. • Can be used on a wide range of fasteners. • All are suitable for Spline, Metric Hex and Bi-Hex, with many also equivalent to TRX-Star*, Whitworth, Imperial Hex and Imperial Bi-Hex. • Sizes: 10, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24mm. • Knurled ring for extra grip with greasy fingers. • Supplied on rail. • Lifetime guarantee*.