Internal Torx, Internal Hex, External Hex, Hex, TX
AF, Torx, Metric, Imperial, SAE
7/8 ", 9/16 ", 5.5 mm, 5/16 ", 1-1/2 "
1, 2-1/2, 1/2, 1-1/2, 3/8
19.05, 25.4, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide