HIGH LOAD CAPACITY: Unlike traditional door hinges, our hidden door hinge has a unique up and down link design structure, replacing traditional door frame hinges. They are supported by the bottom arm and the floor instead of the frame, which reduces the stress on the frame. It can withstand a weight of 100 kg. EASY TO INSTALL: Comes with 10 stainless steel screws. Our instructions list every step of the installation, and if you follow them, you will easily install the pivot hinges. PACKAGE INCLUDED: 1 set L-shaped pivot hinge, 10 pcs screws. PERFECT FOR HIDDEN DOORS: This pivot hinge works great for building a hidden door. And the door pivot hinge can rotate 180 degrees. Perfect for bookshelf door, bookcase door, cabinet door, panel door, etc. EXCELLENT SERVICE: To ensure quality, each of our pivot hinges undergoes strict quality control before leaving the factory. If you have any questions about our pivot hinges, please do not hesitate to contact us, we will reply to you within 24 hours and provide you with a satisfactory solution! STURDY METAL CONSTRUCTION: The pivot hinge is made of high-quality stainless steel, which has been welded by professional welders. Excellent process makes the door hinges rust-proof, corrosion-resistant, sturdy and durable.