Product Name: Square frame Ductile Iron Tree Grating Model NO.: iron casting Certification: ISO 9001:2008 Standard: AISI Surface Roughness: Ra12.5 Surface Treatment: Epoxy or Black Bituminous Painting Material: Iron Machining: Boring Machine Application: Hardware Sand Core Type: Resin Sand Core Casting Method: Directional Crystallization Type: Clay Dry Sand Size: 900x900mm Trademark: MINGDA Transport Package: Iron or Wooden Pallets Specification: SGS Origin: Hebei China Product Description Product description:Material: ductile iron GGG50Specification: 900 x 900 x 50mmSurface: black bituminous paint, epoxy painting or as per client's requirementsPackaging: iron or wooden pallet with steel strip and plastic filmAdvantages: non-slip and safe, easy installation, easy to clean, excellent anti-pressure and attractiveappearanceStandards: BS EN124, ASTM, DINDelivery lead time: 15-30 daysService: OEM/ODM availableInspection: professional labApplications: pedestrians, car parks, aircraft pavementsOthers: owning experienced designing teamProduction facility: traditional hand molding and automatic molding lines to manufacture manhole coversfor better surface condition and dimension accuracyProducts showOur factory