... Diameter: 300-1800mmMaterials: Various Grade Cast iron and Grey Cast Iron: - Grey Cast Iron Types: GG15 ,GG20, GG23, GG25 ,GG30 - Ductile Cast Iron Types: GGG40, GGG50, GGG60, GGG70 ... , GGG80, GGG90Shape: Round, Square, Ractangle Features:1) Product information: Manhole Covers are manufactured ...