Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
11/16 ", 5/8 ", 9/16 ", 3/16 ", 13 mm
25.4, 9.53, 38.1, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate