Internal Hex, External Hex, Hex, TX, External Torx
Imperial, AF, Torx, Metric, SAE
5/8 ", 5/16 ", 9 mm, 23 mm, 11/16 "
1/4, 3/4, 1-1/2, 2-1/2, 3/8
9.53, 19.05, 25.4, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide