Smooth Motion Feature: Built in ball technology enables gentle and quiet door movement, reducing loud closing noises Versatile Usage preferences: consistent various door types including wood, glass, and metal surfaces These rotating hinges provide firm and flexible movement, suiting different interior designs for homes or work spaces Simple Setup Process: Designed for easy assembly without tools, the straightforward attachment allows quick installation in minutes Seamless Visual Effect: The single unit rotating concealed hinge blends perfectly with door frames, creating a clean 360 degree hidden door appearance Strong Stainless Build: Made from sturdy rust resistant stainless steel, these hidden hinges provide consistent strength and long lasting defense, Manufacturer: FHGSPQWM