Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Metric, Imperial, Torx, SAE
4 mm, 7/32 ", 3/4 ", 5/16 ", 5/8 "
1/4, 3/4, 1-1/2, 1, 2-1/2
25.4, 19.05, 38.1, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide