Wide Applications - Use concealed door hinges to add a touch of mystery and elegance to your space. Create a hidden door that rotates 360 degrees. The Murphy door hinge kit is perfect for secret bookcase doors, cabinet doors, panel doors, and more. High Load Capacity (300 lbs) - The concealed door hinge bookcase features a unique upper and lower link design structure, supported by the bottom arm and floor, reducing stress on the frame. Murphy door bookcases offer greater strength and stability, supporting weights up to 136 kg/300 lbs. Package Includes - The concealed door hinge kit includes 1 set of pivot hinges and 24 screws. The hinges measure 6 x 1.2 inches, with a plate thickness of 0.23 inches. Concealed hinges for secret doors are an indispensable accessory for home living. Sturdy and Durable - The heavy-duty pivot door hardware is made of thickened stainless steel, rust-resistant and corrosion-resistant, with a strong load-bearing capacity. The pivot hinge hardware supports a maximum load of 300 lbs and is finely crafted for a longer life. EASY TO INSTALL - Follow the steps below to easily install the invisible hinge hardware on the top layer of the door and connect to the holes on the door surface, then secure the door balls and screws.