Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
3/16 ", 5/16 ", 7/16 ", 11/16 ", 9 mm
3/4, 1, 2-1/2, 1-1/2, 3/8
12.5, 19.05, 38.1, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide