External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
5/8 ", 3/4 ", 28 mm, 29 mm, 11/16 "
1/2, 1/4, 1-1/2, 3/4, 2-1/2
12.5, 19.05, 9.53, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide