Internal Hex, External Hex, External Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
5.5 mm, 15 mm, 25 mm, 29 mm, 11/16 "
19.05, 25.4, 9.53, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide