SEALEY Socket Set 19pc 1/2"Sq AK70619 Sealey Drive Total Drive®-FAST DELIVERYHardened and heat treated Chrome Vanadium steel Total Drive® sockets with a fully polished mirror finish.All are suitable for Spline, Metric Hex and Metric Bi-Hex and many are equivalent to TRX-Star*, Whitworth, Imperial Hex and Imperial Bi-Hex.Includes knurled ring for extra grip with greasy fingers.Supplied in storage case.