Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
5/16 ", 7/16 ", 25 mm, 29 mm, 1-1/2 "
1-1/2, 2-1/2, 3/8, 3/4, 1
25.4, 6.35, 19.05, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide