Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Metric, Imperial, Torx, SAE
3/16 ", 13 mm, 9/16 ", 11/16 ", 1-1/2 "
1-1/2, 3/4, 1, 3/8, 2-1/2
9.53, 19.05, 6.35, 12.5, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide