Material:403,201,202,304,304HC,304L,310S,316,316L,317L Surface:bright,polished,black Certificate:ISO,SGS Stainless Steel Hubbed Flange/Welding Neck FlangeMaterial:403,201,202,304,304HC,304L,310S,316,316L,317LSurface:bright,polished,blackCertificate:ISO,SGS 304 Stainless Steel Hubbed Flange/Welding Neck Flange