External Hex, Internal Torx, Internal Hex, TX, Hex
Torx, AF, Imperial, SAE, Metric
3/8 ", 7/8 ", 9/16 ", 9 mm, 23 mm
1-1/2, 1/4, 2-1/2, 3/8, 1/2
19.05, 6.35, 38.1, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Oxide, Black Phosphate