Riveting nut(Flat head,Knurled body , Closed end) Specification:M3-M12 material: steel, stainless steel, ... ,aluminium. Riveting nut(Flat head,Knurled body , Closed end) We use cold forged technique, not only save materials ... head ,countersunk head, round body, hex body, open end, closed end, body with ribben, body with groove and so on ... according to customer's drawing requirement closed end rivet nut