Widely Application - Use the hidden door hinge to add a touch of mystery and elegance to your space. You can create a hidden door that rotates 360 degrees. The murphy door hinge kit is ideal for secret bookcase door, cabinet door, panel door and more.High Load-Bearing 300lbs - Hidden door hinge bookcase has a unique design structure of up and down linkage, which is supported by the bottom arm and floor, reducing stress on frame. The murphy door bookcase has greater strength and stability to support up to 136kg/300lbs of weight.Package Included - Hidden door hinge set included 1 set of pivot hinge with 24 screws, measureing 5.8 x 1.2 inch, plate thickness 0.24 inch; 1 pcs door ball catch hardware with 4 screws. Hidden hinges for secret door, which an indispensable accessory in home life.Sturdy & Long-lasting - Heavy duty pivot door hardware is made of thickened stainless steel, rustproof and corrosion resistant, strong load-bearing capacity, pivot hinge hardware a maximum of 300 lbs, with fine workmanship and the service life is longer.Easy To Install- By following the steps, the invisible hinge hardware can be easily installed on the top layer of the door and connected to the hole on surface of the door, then fix the door ball and screw.