Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Imperial, Torx, AF, SAE
5/16 ", 7/8 ", 35 mm, 28 mm, 1-1/2 "
3/8, 1/2, 1-1/2, 1, 2-1/2
38.1, 25.4, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide