Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
13/16 ", 5/8 ", 7/8 ", 3/16 ", 13 mm
3/4, 1-1/2, 2-1/2, 3/8, 1
19.05, 38.1, 25.4, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate