Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, AF, Torx, Imperial, SAE
9/16 ", 7/16 ", 5 mm, 5/8 ", 11/16 "
1-1/2, 1/4, 2-1/2, 1/2, 3/4
9.53, 6.35, 19.05, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate