External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
5.5 mm, 6 mm, 7/8 ", 9/16 ", 9 mm
1-1/2, 1, 2-1/2, 1/2, 3/8
6.35, 19.05, 12.5, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide