Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
7/16 ", 5 mm, 5/16 ", 35 mm, 1-1/2 "
1-1/2, 3/4, 1, 2-1/2, 1/2
9.53, 25.4, 12.5, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide