Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
12 mm, 9/16 ", 5.5 mm, 16 mm, 11/16 "
1/4, 1-1/2, 3/8, 1/2, 3/4
19.05, 25.4, 12.5, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide