External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Imperial, Torx, Metric, SAE
7 mm, 9/32 ", 5/16 ", 9 mm, 5/8 "
3/8, 1/4, 1-1/2, 1, 2-1/2
19.05, 12.5, 6.35, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide