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SELECTED QUALITY: This cast iron drainage grate is made of ductile cast iron. It is not easy to aging, rusting and corrosion. Even if it is in a wet environment for a long time, it can keep the good performance of the material. And the tensile strength is better, suitable for long-term use. GRATE DRAINAGE: Designed with multiple grate drainage openings for faster drainage. The grille openings are appropriately sized to effectively filter out larger debris such as dead leaves, plastic bags, etc. to prevent sewer clogging. ANTI-SKID DESIGN: This heavy duty cast iron drainage grate has a rough surface and many small holes to increase friction and prevent pedestrians from falling. HEAVY LOADING CAPACITY: This cast iron drainage grate is made of heavy-duty structure with good compression resistance, the maximum load can be up to 661.39LBS. installed on the road surface, it is strong enough to withstand more pressure and not easy to be damaged. STRONG AND DURABLE: It is produced by high temperature molding. The one-piece structure without welded joints is very strong and stable, not easy to deform and break.