Internal Hex, Internal Torx, External Torx, TX, Hex
Imperial, Torx, AF, SAE, Metric
5/16 ", 9/16 ", 26 mm, 36 mm, 28 mm
1/4, 3/4, 1, 1-1/2, 2-1/2
19.05, 25.4, 38.1, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide