Specifications: Each spring has a backward curvature design at both ends, the spring is not easy to fall off, the machine is cut evenly, the size is accurate and stable, the cutting is neat, no friction, no rust. . ;The sofa spring repair kit is designed to connect a zigzag curved, non-recessed spring to a wooden frame of upholstered furniture for seating in furniture upholstery, automobiles or other applications Product Name: Sofa Replacement Springs Material: Iron, Plastic, Carbon Steel Size: 50 x 48 mm (length x width) Installation method: 1.First fix the clamp hole to the No. 1 spring on the wooden frame of the sofa with a nail. 2. 1.Hook the serpentine spring to the spring loop. 3.Use the nail to fix the spring button 2. 3-hole position, that is, the installation is complete. (Refer to the picture shown) Package includes: 2 x sofa springs x 4 x sofa spring clips (screws not included). The measurement allowed error is +/- 1-5mm. is committed to providing each customer with the highest possible quality of customer service.