Manufactured from hardened and tempered Chrome Vanadium steel, with a phosphate finish for added corrosion resistance. WallDrive® sockets allows a transfer of up to 30% more torque to the fixing. Colour-coded rings for fast identification. Socket sizes include 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24mm. Supplied in a storage case with a lifetime guarantee.