Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Torx, AF, Metric, SAE
5.5 mm, 3/4 ", 7/16 ", 9/16 ", 11/16 "
1-1/2, 3/4, 1, 2-1/2, 3/8
25.4, 19.05, 6.35, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide