4-piece folding flat hinge holes, stainless steel exterior hinges, heavy-duty door hinges for fixed doors, entrance doors, bedroom doors, garden doors High-quality materials: Our door hinges are made of zinc alloy, so they are corrosion-resistant and not easy to rust. The brushed surface is treated and smooth, and can be used indoors and outdoors. The balls and bearings are closely connected to provide cushioning for the door. Humanized design: The stainless steel hinges are equipped with scientific positioning holes and sturdy shafts, which can balance the weight, reduce noise and run smoothly. It can be easily installed on the edge of the door. 4 mounting holes design: The 4-hole mounting design enables different components to be stably and safely connected to each other, and can be installed on the door more firmly and can be used for a long time. Exquisite and beautiful: This product has a beautiful appearance and is suitable for various decoration styles. Meet your aesthetic needs and add a touch of sophistication to your home. Wide range of applications: This door hinge is suitable for installation on different types of doors. They are very suitable for fixing bedroom doors, entrance doors, bedroom doors, garden doors, fire doors, furniture doors, tool boxes, etc.