Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Metric, Torx, SAE
9/32 ", 5/16 ", 7/8 ", 5.5 mm, 1-1/2 "
19.05, 38.1, 6.35, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide