Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, AF, Torx, Imperial, SAE
1 ", 5/16 ", 11 mm, 7/16 ", 1-1/2 "
1/2, 1/4, 3/4, 2-1/2, 3/8
25.4, 9.53, 6.35, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide