Internal Torx, External Torx, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
12 mm, 4.5 mm, 15/16 ", 3/16 ", 11/16 "
1-1/2, 1, 2-1/2, 1/2, 3/4
38.1, 6.35, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide