SMOOTH OPENING AND CLOSING: This product is 4 inches Door Hinges. It features an improved design with built-in ball bearings. The door opens or closes silently after a quiet and noiseless process. The spherical shaft design effectively ensures the smooth and flexible door opening effect and the retaining effect, and the door opens smoothly. GOOD DURABILITY: The stainless steel hinge is made of 304 stainless steel, so it is corrosion-resistant and not easy to rust. The brushed surface is smooth and can be used indoors and outdoors. The ball and bearing are tightly combined to act as a buffer door. EASY TO INSTALL: The package contains high-quality mounting hardware for quick and easy installation. Comes with compatible screws to meet your needs and can be done in minutes. The plate forming material is sufficient, the force area is large, the bearing capacity is strong, and it is not easy to deform. MODERN ELEGANCE: Simple in shape and beautiful in appearance, these door hinges are