This Teng Tools socket is a professional bi-hexagon 3/4 inch drive socket. The socket is in imperial AF size, and is manufactured from chrome vanadium steel with a satin finish. The socket is produced in accordance with ISO 9000 and AS954 specifications for increased torque and reduced risk of rounding fasteners.The TENM340148 bi-hexagon 3/4 inch drive socket has the following specifications:AF Size: 1.1/2inch.Length: 60mm.