Riveting nut types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove Riveting nutwe use cold forged ... industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on ... /16,5/16. material: steel, stainless steel, brass,aluminium. Reduced Head Rivet nut