Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Metric, Torx, Imperial, SAE
3/16 ", 7/16 ", 9 mm, 25 mm, 1-1/2 "
19.05, 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