Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Torx, AF, Metric, SAE
7/8 ", 3/16 ", 5.5 mm, 1/2 ", 34 mm
3/8, 1-1/2, 2-1/2, 3/4, 1/2
9.53, 6.35, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate