Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Metric, Imperial, Torx, SAE
7/16 ", 5/8 ", 11/16 ", 34 mm, 1-1/2 "
1/2, 3/4, 1, 1-1/2, 2-1/2
19.05, 38.1, 12.5, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate