Internal Hex, Internal Torx, TX, Hex, 6-Point
Torx, Imperial, AF, Metric, SAE
7/32 ", 9/32 ", 9/16 ", 5.5 mm, 3/16 "
1-1/2, 3/8, 1, 1/2, 2-1/2
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide