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3D Invisible Adjustable Heavy Duty 200kg Hidden Concealed Large 304 Stainless Steel Hinge for Gate Steel Door. Heavy Duty Capacity: Supports up to 200kg door weight per pair of hinges. 304 Stainless Steel: Made from durable 304 stainless steel with zinc plating finish. 3D Adjustable Design: Hidden 3D adjustable mechanism prevents door droop over time. OEM/ODM Available: Customization options available for styles and door specifications. 2-Year Warranty: Comprehensive 2-year warranty with online after-sales support. Precision Manufacturing: High-precision production ensures stability and long service life.