The hidden door pivot hinge is made of stainless steel, offering increased strength and durability. The surface is specially treated to resist rust and breakage, with fine craftsmanship to enhance service life. This hidden door hinge features a high load-bearing design, supporting up to 260kg (573LB). It eliminates the need for unstable steel balls, with a unique pivot mechanism enabling smooth and flexible rotation. The top pivot includes a telescoping pin that allows shaft adjustment for quick and easy installation. These rotary hidden hinges can be mounted on the top layer of the door and secured into a hole on the door surface. A screwdriver is included for convenient setup. If needed, a groove can be carved to accommodate fit. Equipped with an up and down link function, it enables 360-degree rotation. Utilizing multi-angle rotation and strong load-bearing capacity, this hinge creates an invisible door opening effect, adding intrigue and elegance to your space. The hinge features a unique upper and lower connection design, supported by the lower arm and floor, reducing stress on the door frame. Suitable for various types of invisible doors, ideal for bookcase doors, bookshelf doors, cabinet doors, and panel doors. Color: Black Material: Stainless Steel Package Contents: 1 set x Door Hinge Kit Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.