External Hex, Internal Hex, Internal Torx, Hex, TX
Imperial, Metric, AF, Torx, SAE
12 mm, 5/8 ", 3/16 ", 11/16 ", 9 mm
1-1/2, 2-1/2, 1/4, 1, 1/2
9.53, 6.35, 25.4, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide