... 304/316 stainless steel or as per customers' request 4.Surface treatment:, chroming,desalting,etc5.Metal processing: milling,lathing,routing,refining ... Name stainless steel valve part Product description1)Material:304/316 stainless steel or according to your requirement.2)Surface treatment: according to ... machining,drilling,powder coating,pressing part,polish,etc. wedge disc for Knife gate valve part