Internal Hex, External Torx, TX, Hex, 6-Point
Metric, AF, Imperial, Torx, SAE
5.5 mm, 15/16 ", 5/16 ", 8 mm, 9 mm
1/2, 3/4, 1/4, 2-1/2, 3/8
12.5, 38.1, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide