General description Manufactured from hardened and tempered Chrome Vanadium steel, the Sealey AK56160M Lock-On Impact Socket Set features a phosphate finish for added corrosion resistance. The Lock-On™ design includes specially machined flutes in the walls of the socket, allowing for use on up to 85% rounded fasteners. This set is part of the SEALEY PREMIER range, suitable for daily professional use, and is supplied in a convenient storage case. Technical specifications Drive Size: 1/2'' Sq Number of Pieces: 13 Material: Chrome Vanadium steel Other information Colour-coded rings for fast identification Lifetime guarantee*