This door bookcase hinge is made of thickened zinc alloy and can bear up to 570 pounds. It can withstand frequent use, ensuring its durability. This hidden door hinge set includes all the necessary hardware accessories. You only need to install the door hinge directly on the door with screws and tighten it. It is not easy to fall off or loose after installation. This door hinge kit is suitable for various doors, including wooden doors or metal doors. It is suitable for hidden doors, hidden bookcases, hidden partitions, etc. The design of this hidden door hinge allows it to rotate 360°. It can be installed on the center or the side of the door to smooth movement after installation. You receive a set of door hinges, including mounting screws, gloves and screwdrivers. No other tools are required, and it can be used and installed quickly, Weight: 2.5300028724858 Pounds, Manufacturer: Frewurwer