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