Silent & Safe OperationThe roller track mechanism ensures noiseless opening/closing. Its stable cross-shaped structure minimizes loosening risk, while precision engineering prevents finger-pinching accidents for family safety.Perfectly Hidden DesignThis 3D cross hinge features a fully concealed design. When installed and the door is closed, the hinge remains entirely hidden. Its fully enclosed structure even conceals internal screws, ensuring a sleek, seamless appearance for your door.3D Adjustment RangeAPPLICABLE DOOR SIZE - Door Thickness 35mm, Door Width 850mm,up and down 3.0mm, left and right 2.0mm, before and after 1.0mm, do not have to remove the door can be adjusted.Premium Material & Enhanced Load CapacityCrafted from rust-resistant premium zinc alloy, this durable hinge boasts a newly upgraded siding of the hinge design. With a weight capacity of 265 lbs, it effectively prevents breakage from excessive force, guaranteeing long-term reliability.Applications&InstallationIdeal for secret doors, hidden bookshelves, cabinet doors, flip-up windows, wooden doors, and more. Includes a detailed installation manual and a set of 3D adjustment tool.This product requires high diy ability. Installation requires the assistance of an electric drill. You can make an appointment in advance for professional assistance.