Draper Expert 28561 27mm 1/2" Square Drive Powerdrive Impact Socket. A range of 6-point sockets forged from chrome vanadium steel that has been hardened, tempered and chemically blackened for corrosion protection. The sockets are suitable for use with air, electric or manual impact wrenches. Size 27mm. Draper type 28561. Specifications: Type: 1/2in Impact socket. Size: 27mm. Expert Quality, 6 point sockets forged from chrome vanadium steel hardened, tempered and chemically blacked for corrosion protection. These sockets are for use with air, electric or manual impact wrenches. Display packed. Safety Note: ONLY impact sock.