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. Knurled ring for extra grip with greasy fingers. Supplied on rail. Features & Benefits: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: 13, 14, 15, 16, 17, 18, 19, 21, 22, 24mm.Knurled ring for extra grip with greasy fingers.Supplied on rail.Lifetime guarantee*.Model No. AK70610D Specifications: Model No AK70610D Brand: Premier Configuration: Total Drive® Content