Internal Torx, External Hex, TX, Hex, 6-Point
AF, Metric, Imperial, Torx, SAE
5.5 mm, 7/16 ", 7/32 ", 3/8 ", 3/16 "
1/4, 3/4, 2-1/2, 3/8, 1/2
9.53, 6.35, 19.05, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide