... 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 ... : 1/2,3/8,1/4,5/32 3/16,5/16. material: steel, stainless steel, brass,aluminium.ProductsMaterialFinish(plating)SizeStandardrivet nut1.steel ...