... head,Knurled body , Closed end) Specification:M3-M12 material: steel, stainless steel, brass,aluminium. Riveting nut(Flat head,Knurled body , Closed end) We use cold forged ... types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on . also ... nutscrewWe can produce according to customer's drawing requirement closed end rivet nut