Internal Hex, External Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
13 mm, 17 mm, 5/16 ", 11/16 ", 29 mm
3/8, 1, 1-1/2, 2-1/2, 3/4
9.53, 6.35, 12.5, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate