Iron casting manhole covers, square outside, round inside

Item: Manhole cover Material: Ductile iron or grey iron Stardand: D400,C250,B125,A15　 Size: 200mm-1200mm or as your request Shape: Round, square, triangle or as your request Well sealed no noise pollution and rebound Surface: Bitumen, painting, water-solubility painting Nice appearance and corrosion resistance Perfect design Our factory is specializing in manhole cover and grate for the roads, communication, construction and electric power. These products are delivered to