Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, SAE, Metric
13/16 ", 7/16 ", 3/16 ", 5/16 ", 25 mm
1-1/2, 3/4, 2-1/2, 3/8, 1
19.05, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide