General description US PRO Bit Socket Set Triple Square Spline includes 6 pieces designed for various applications on European vehicles. This set is essential for removing and installing head and accessory bolts, axle shaft bolts, and more on popular models from Mercedes, VW, Audi, and Porsche. Technical specifications Drive sizes: 3/8” and 1/2” Socket sizes: M6 (48.5mm L), M8 (58mm L), M10 (67.8mm L), M12 (108mm L), M14 (108mm L), M16 (108mm L, Tamper Proof) Usage M6: Remove and install head and accessory bolts on Mercedes; axle shaft bolts on VW and Audi M8: Used for cylinder head bolts and drive shaft bolts on Mercedes; cylinder head bolts on VW and Audi M12: Remove and install cylinder head bolts on Mercedes; rear toe adjustment on 1999 and newer Audi A6; axle shaft bolts on new VW M14: Used for 2003 and later VW Touareg front axle bolts; 2003 and later Porsche Cayenne front axle bolts; various Audi/VW axle boots; Audi TT differential mount bolts; transmission drain plug M16: Used