External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, Metric, SAE
5/16 ", 7/16 ", 5/8 ", 30 mm, 1-1/2 "
3/4, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 25.4, 9.53, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide