Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, SAE, Metric
4.5 mm, 5 mm, 7/16 ", 5.5 mm, 9/16 "
1, 1-1/2, 3/4, 3/8, 2-1/2
6.35, 38.1, 12.5, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide