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25*150mm Cheap Price 3D Adjustable Invisible Hidden Door Concealed Hinge 40kg. 3D Adjustable Design: Allows precise alignment for door thickness above 33mm. High Load Capacity: Supports up to 40kg per pair of hinges. Durable Zinc Alloy: Constructed from high-quality zinc alloy with zinc plating finish. 2-Year Warranty: Covers mechanical defects for a period of 2 years. OEM/ODM Available: Full customization and minor customization options available. Anti-Droop Technology: Precision manufacturing prevents the droop phenomenon common in low-end products. ISO9001 Certified: Manufactured under ISO9001:2015 management system certification. 100% Quality Inspection: Every finished product undergoes visual and functional inspection.