Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
7/32 ", 7/16 ", 15/16 ", 5.5 mm, 8 mm
1-1/2, 3/8, 1, 2-1/2, 1/2
6.35, 19.05, 38.1, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide