Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
5.5 mm, 9 mm, 5/16 ", 5/8 ", 9/16 "
1, 1-1/2, 2-1/2, 1/2, 3/4
19.05, 12.5, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide