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: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14mm.Knurled ring for extra grip with greasy fingers.Supplied on rail.Lifetime guarantee*.Model No. AK69813 Specifications: Model No AK69813 Brand: Premier Configuration: Total Drive® C