The components of this Draper HI-TORQ® 6-point deep impact socket set are forged from hardened and tempered chrome vanadium steel. They have a black phosphate finish for corrosion protection. The sockets are in variety of sizes from 8-24mm and the set includes a 125mm and 250mm 1/2" Sq. Dr. impact extension and 70mm 1/4" hex to 1/2" Sq. Dr. adaptor. Supplied in a sturdy blow moulded case.