Apex® 1/2 in square drive sockets, SAE, socket head bits, complete, adapter only, insert only from Cooper Tools. Apex® impact sockets have hex tolerances that are on average 48% tighter than DIN and 35% tighter than ANSI requirements. All Apex® sockets have the tightest tolerances for straightness and concentricity in the industry. Apex® impact sockets are specifically designed and manufactured for high impact use, and made from a tougher and more ductile alloy steel which is then heat treated for extra durability.