Widely Applicable – Use the hidden door hinge to add a touch of sophistication and seamless design to your space. Ideal for creating rotating doors, secret bookcase doors, cabinet doors, panel doors, and other custom installations. High Load-Bearing Capacity – Supports up to 300 lbs. Features an upper and lower linkage structure, with floor-supported bottom arm to reduce stress on the frame, enhancing strength and stability. Package Includes – One set of pivot hinges with 24 screws (5.8 x 1.2 inches, plate thickness 0.24 inches); one door ball catch with 4 screws. Sturdy & Long-Lasting – Constructed from thickened stainless steel, rust-resistant and corrosion-resistant, with precision craftsmanship for extended service life. Easy to Install – Designed for straightforward installation on the top and bottom of the door, with clear mounting points and secure fastening.