Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
7/16 ", 9/16 ", 23 mm, 1-1/2 ", 9 mm
1, 3/4, 3/8, 2-1/2, 1-1/2
9.53, 6.35, 38.1, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide