... :M3-M12 material: steel, stainless steel, brass,aluminium. Riveting nut(Flat head,Knurled body , Closed end) We use cold forged technique, not ... :M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/2,3/8,1/4,5/32 3/16,5/16. material: steel ... can produce according to customer's drawing requirement closed end rivet nut