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