Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
9/16 ", 5.5 mm, 8 mm, 13/16 ", 7/16 "
12.5, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide