External Hex, Internal Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
1 ", 3/16 ", 25 mm, 35 mm, 1-1/2 "
1-1/2, 3/4, 2-1/2, 1/2, 3/8
19.05, 6.35, 38.1, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Oxide, Black Phosphate