Carbon Steel Flange: Size:1/2"-60" Type:WN SO Blind Plate SW Standard: ANSI B16.5 BS4504 DIN2576 2632 2633 Carbon Steel Flange:Size:1/2"-60" Type:WN SO Blind Plate SW Standard: ANSI B16.5 BS4504 DIN2576 2632 2633 Materials: carbon steel or stainless steelFacing method: rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored electroplate, powder coating ...