Internal Torx, Internal Hex, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
4 mm, 7/32 ", 7/16 ", 13/16 ", 5/16 "
25.4, 12.5, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide