Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
5.5 mm, 7/16 ", 5/8 ", 11/16 ", 11 mm
1/2, 3/4, 1-1/2, 1/4, 2-1/2
12.5, 25.4, 9.53, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide