Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
11/16 ", 5/16 ", 7/8 ", 5 mm, 9/16 "
2-1/2, 1-1/2, 3/8, 1/2, 3/4
6.35, 25.4, 19.05, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide