Drive Master Mechanic with 19 mm Impact Shallow Socket Master Mechanic, 1/2Dr 19mm Imp Shallow Socket. 1/2 in. drive socketsare manufactured from chrome molybdenum alloy steel and designed to withstand rigors of heavy duty use. Size markings have been hard stamped into the sockets for quick and easy identification that will never wear away. Each socket features chamfered leadins on both ends allowing for easy attachment to drive tools and placement onto fasteners. Specifications. Size 0.5 in.. Impact Size 19 mm. Height 1.49 in.. Width 1.02 in.. Length 1.02 in.. Weight 0.18 lbs