Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
4 mm, 9/32 ", 15/16 ", 9/16 ", 35 mm
2-1/2, 1-1/2, 1/4, 3/8, 3/4
25.4, 12.5, 6.35, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide