Unique Bearing Design The accurate and distinctive design of the base bearing device enables the door to shift calmly, smoothly and nimbly.Wide Application Appropriate for wooden doors and aluminum frame doors. Specialized design and production for hidden door bookcase, bookshelf door, swing door, hidden shelf door concealed door, heavy-duty door, secret door360 Fully RotationUp and down linkage style,the hinge could be installed on the central axis of the door with 360switched; if installed on the side, could be switched 180. Rather high versatility.Premium MaterialMade of thick solid 304 stainless steel, solid and durable. Specially treated painted surface to keep corrosion-resistant and elegant. Well-crafted to keep running smoothly.High load-bearing capacity. Up to 600 pounds of maximum load-bearing. The exquisite and scientific design, high-strength structure are sufficient to cope with the vast majority of scenarios.