External Hex, Internal Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
9/32 ", 5 mm, 9/16 ", 3/16 ", 35 mm
3/4, 2-1/2, 1-1/2, 1/2, 3/8
38.1, 9.53, 19.05, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide