External Hex, Internal Hex, Hex, TX, External Torx
Imperial, Metric, AF, Torx, SAE
3/16 ", 1/4 ", 5/8 ", 11/16 ", 9 mm
3/4, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 19.05, 9.53, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate