[SMOOTH OPENING AND CLOSING]The stainless steel door hinge is a 4-inch door hinge. It uses an improved design with internal ball bearings. After turning off and on again, no sound can be heard when opening or closing the door. The spherical shaft design effectively ensures a smooth and flexible door opening effect and a mute effect, and the door opens smoothly. [GOOD DURABILITY]The hinge is made of stainless steel, so it is corrosion-resistant and not easy to rust. The brush surface is smooth and can be used indoors and outdoors. The balls and bearings are tightly connected to cushion the door. [EASY TO INSTALL]The door hinge package contains high-quality mounting hardware for quick and easy installation. Contains compatible screws that meet your requirements and can be completed in a few minutes. The slab has sufficient casting materials, the force-bearing area is large, the bearing capacity is strong, and it is not easy to deform. [MODERN STYLE]This stainless steel door hinge is