These Draper HI-TORQ® 6-point impact sockets are forged from hardened chrome molybdenum. Black phosphate finish for corrosion protection. Includes sizes 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 27mm. For use with electric or pneumatic impact wrenches with a 1/2" drive. Supplied inside an EVA drawer insert tray, 138 x 270 x 42mm. It is suitable for use in Draper and Draper Expert tool chests and other manufacturer's similar products.