Internal Torx, External Hex, Internal Hex, TX, Hex
Imperial, Torx, AF, Metric, SAE
12 mm, 3/16 ", 5/16 ", 5/8 ", 28 mm
1-1/2, 3/4, 1, 2-1/2, 1/2
25.4, 19.05, 6.35, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide