External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Metric, Imperial, Torx, SAE
5.5 mm, 9/32 ", 7/16 ", 9/16 ", 5/8 "
1/2, 1, 1-1/2, 3/4, 2-1/2
38.1, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide