Internal Hex, External Hex, Internal Torx, Hex, TX
AF, Imperial, Torx, Metric, SAE
9/32 ", 11/16 ", 15/16 ", 5/16 ", 7/16 "
1-1/2, 1, 2-1/2, 3/8, 1/2
38.1, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide