Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
5 mm, 3/16 ", 5/16 ", 34 mm, 11/16 "
1/4, 1, 1-1/2, 2-1/2, 1/2
9.53, 12.5, 38.1, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate