Teng TENM120120 Bi-Hexagon Socket 12 Point Regular A/F 1/2in Drive 5/8in. Size 5/8 AF, Length 38mm. A professional bi-hexagon, AF socket produced in accordance with ISO 9000 and AS5954 specifications for increased torque and reduced risk of rounding fasteners. Manufactured from chrome vanadium steel with a satin finish. 1/2in Square Drive.