External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, Torx, Metric, AF, SAE
5/8 ", 3/16 ", 5/16 ", 9/16 ", 11 mm
1-1/2, 3/4, 1/4, 1, 2-1/2
9.53, 25.4, 19.05, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide