1. The sturdy and durable hinge is made of stainless steel, which is rustproof, non-corrosive and durable. Invisible design, simple and practical 2. The spring has high strength and durability, and the opening angle is 80. For the upper lifting material support, it is suitable for folding beds, folding sofas, folding sofas, cabinet doors with lifting doors, etc. 3. Each package includes one left spring hinge and one right spring hinge. Screws not included 80 Degree Collapsible Spring Hinge 2 Pack 80 Degree Spring Hinge Closet Doors Lift Up and Open Support for Cabinet Door, Sofa, Hardware Accessories. Features: Material: cold rolled steel plate. Surface treatment: nickel plated. Scope of application: cabinet doors, sofas, etc. Service life: opening and closing more than 50,000 times. High quality springs guarantee strength and long life, with an opening angle of 80. The nickel-plated surface is smooth and shiny. Each set has left and right spring hinges. Swivel sofa pillow. You can adjust the sofa headrest to a steeper or more inclined state to find the angle you want. At the same time, this product can also be used in cabinets, lockers and other places , you can easily open and close cabinets or lockers. Uses: sofa headrest, bedside table, wardrobe, etc.