Teng tools sockets are manufactured from strong chrome vanadium steel in accordance with iso9000 and as954 they provide excellent torque whilst reducing the risk of rounding fasteners this tthex23 socket set consisting of 20 regular and long bits for internal hex heads it also includes 2 adaptors and a 2 mm hex mini screwdriver supplied complete in a handy storage tray this 23 piece set contains the following6 x 40mm hex bits with 10mm hex drive 5 6 7 8 9 and 10mm 4 x 40mm hex bits with 12mm hex