Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
3/8 ", 5/16 ", 10 mm, 11/16 ", 28 mm
3/4, 1, 2-1/2, 1-1/2, 1/2
38.1, 9.53, 19.05, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide