Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Metric, Imperial, SAE
9/32 ", 11/32 ", 4.5 mm, 7/32 ", 5/16 "
1/4, 1-1/2, 2-1/2, 3/8, 3/4
19.05, 38.1, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide