Gem Bids For Steel Pipe Flanges As Per Is 6392, Fittings And Accessories For Power Transformer, Drain Valve And Flanges As Per Is:3639, Blind Flange, Mounted Bearings, Stainless Steel Ansi B16.5 Flange, Aortic Cannula (v2), Hot Rolled Steel Beam, Column, Channel And Angle Sections (v2) Conforming To Is 808