Draper expert t55 x 140mm tx star 12 square drive socket bit draper expert 55662 expert quality socket with insert bit socket manufactured from chrome vanadium steel hardened tempered and chrome plated the bit is made from s2 silicon steel hardened and tempered with sand blast finish display packeddraper tx star products are compatible with 134torx fixing systems134torx is the registered trademark of camcartextron inc chemically blacked finish on bit draper expert 55662 t45