Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, AF, Torx, Imperial, SAE
7/8 ", 5/16 ", 9/16 ", 33 mm, 1-1/2 "
3/8, 3/4, 1, 2-1/2, 1-1/2
38.1, 19.05, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide