Internal Hex, External Hex, Hex, TX, 6-Point
Imperial, Torx, Metric, AF, SAE
7 mm, 18 mm, 19 mm, 11/16 ", 9 mm
1-1/2, 3/8, 1, 2-1/2, 1/2
25.4, 19.05, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide