Internal Torx, Internal Hex, External Hex, Hex, TX
AF, Torx, Metric, Imperial, SAE
13/16 ", 5/16 ", 16 mm, 9/16 ", 1-1/2 "
1-1/2, 3/4, 2-1/2, 1, 3/8
38.1, 9.53, 25.4, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide