stainless steel cap nut 1.Quality guarantee of ISOO9001 2.OEM service provided. 3.Material:200,300,400 series stainless steel cap nut1.Satandard:GB,DIN,AISI,BA,ISO,JIS.2.Material:200,300,400 series3.OEM service provided.4.Surface:bright,polished.5.Size: according to client's requirement.6.Quality guarantee of ISOO9001 stainless steel cap nut