Internal Hex, External Hex, Internal Torx, Hex, TX
Metric, Imperial, AF, Torx, SAE
7/8 ", 9/16 ", 3/16 ", 5.5 mm, 36 mm
2-1/2, 1-1/2, 1/2, 1/4, 3/4
9.53, 19.05, 25.4, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide