Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, Metric, AF, SAE
9/16 ", 11/16 ", 13/16 ", 5/16 ", 7/8 "
1/2, 3/4, 1/4, 2-1/2, 3/8
25.4, 6.35, 9.53, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate