Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
3/16 ", 4.5 mm, 5/16 ", 9/32 ", 11/16 "
25.4, 12.5, 6.35, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide