External Hex, Internal Hex, Internal Torx, Hex, TX
Imperial, Metric, Torx, AF, SAE
15/16 ", 13/16 ", 5/8 ", 3/16 ", 5.5 mm
1/2, 1, 3/4, 1-1/2, 2-1/2
9.53, 38.1, 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