The strong and durable hinges are made of cold-rolled steel, no rust, no corrosion, and durable. Invisible design, simple and practical The spring force is high and durable, and the opening angle is 80°. It is used for top lifting equipment support, suitable for folding beds, folding sofas, folding sofas, lift-up door cabinet doors, etc. Each package includes a left spring hinge and a right spring hinge. Screws not included Folding Sofa Bed Cabinet Hinge Spring Hinge 80 degrees,