Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
3/16 ", 5/16 ", 25 mm, 34 mm, 11/16 "
1/4, 1, 1-1/2, 2-1/2, 3/4
19.05, 9.53, 6.35, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide