568/ Teng TENM340527 M340527-6 Satin Regular Hex Socket 27mm 3/4in Drive. This Teng Tools socket is a professional 3/4 inch drive, metric hexagon socket. The socket is manufactured from chrome vanadium steel for strength and Durability and has an attractive satin finish. The socket is produced in accordance with ISO9000 and AS954 specifications for increased torque and reduced risk of rounding fasteners. Size 27mm. Length 52mm.