The sturdy metal structure is made of thick solid High-quality materials, which is sturdy and durable. The surface is specially treated to prevent rust and breakage , fine workmanship, Increase longer service life Base support up to 570 LB/ 260 kg. High-quality materials, excellent forging process, scientific structure design, high quality screw fixation. The hinge provides stable and strong support for the door Up and down linkage function, hinge installed on the central axis of the door, can be switched 360, installed on the side, can be switched 180, to meet the needs of different styles and scenarios Precision and unique design of base bearing device makes the door move quietly, smoothly and flexibly. Suitable for wooden doors, aluminum frame doors. and manufacturing for Hidden door, Heavy duty door, Secret door, hidden door bookcase, bookshelf door, swing door, hidden shelf door, and door hinge kit for door. You can create hidden doors according to your needs. Installation is fast and simple with our hinges, which include all necessary hardware. Material: Metal colour: Black Package Contents: 1 set hidden door hinges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.