Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, Torx, AF, SAE
9/16 ", 7/16 ", 11/16 ", 34 mm, 29 mm
1-1/2, 3/4, 2-1/2, 3/8, 1/2
19.05, 6.35, 12.5, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide