Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, AF, Torx, SAE
7/16 ", 3/16 ", 5.5 mm, 11/16 ", 34 mm
1-1/2, 3/4, 2-1/2, 3/8, 1/2
25.4, 12.5, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide