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