Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, Metric, SAE
5/16 ", 5/8 ", 3/16 ", 25 mm, 34 mm
1/2, 3/4, 1-1/2, 1, 2-1/2
19.05, 6.35, 12.5, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide