brass screw nut machine screw For car ignition accessoriesThe materials: C3604, C3600, C3602, H59-1, HPb59-1 BZ5A, H62Thread type: M1.0-M16 ,0-80 ,2-56 ,4-40 ,8-32 ,10-24 ,10-32, 1/4-20Surface treatment: degreasingProduction equipment: high precision automatic lathe brass screw