Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
9/32 ", 5.5 mm, 5/16 ", 5/8 ", 9/16 "
1/4, 1-1/2, 2-1/2, 3/8, 1
9.53, 19.05, 6.35, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide