Internal Hex, External Hex, Internal Torx, TX, Hex
Metric, Imperial, Torx, AF, SAE
5/16 ", 9/32 ", 15/16 ", 34 mm, 25 mm
3/8, 1/2, 1/4, 3/4, 2-1/2
25.4, 9.53, 19.05, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide