Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
15/16 ", 5/16 ", 5.5 mm, 17 mm, 11/16 "
1-1/2, 3/4, 3/8, 2-1/2, 1/2
9.53, 19.05, 12.5, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide