countersunk head slotted rivet nut zinc Zn-Ni specification:M5, M6, M8 ... , car, ship, electron and other fittings of industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ... in producing it . And have productive experience for many years. countersunk head slotted rivet nut zinc Zn-Ni