Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
13/16 ", 9 mm, 5/16 ", 5/8 ", 1-1/2 "
3/4, 1/2, 1/4, 2-1/2, 3/8
12.5, 9.53, 6.35, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide