Riveting nut(Flat 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 technique, not only save materials ... . types: flat head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on ...