Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, AF, Torx, SAE
5/16 ", 7/32 ", 15/16 ", 5/8 ", 30 mm
1/4, 1, 1-1/2, 3/4, 2-1/2
38.1, 19.05, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide