Internal Hex, External Torx, External Hex, Hex, TX
Imperial, Torx, Metric, AF, SAE
7/32 ", 9/16 ", 15/16 ", 13/16 ", 5/16 "
19.05, 38.1, 12.5, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide