Internal Hex, External Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
9/16 ", 5.5 mm, 5/16 ", 5/8 ", 35 mm
3/4, 1-1/2, 2-1/2, 1/2, 3/8
19.05, 6.35, 25.4, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide