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