Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
7/16 ", 9/32 ", 5/8 ", 5/16 ", 9 mm
1-1/2, 1/4, 3/8, 1/2, 2-1/2
25.4, 6.35, 38.1, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide