●Advantage Each spring clip has 4 separate holes where nails can be used to attach the springs to the frame. With 4 separate holes, more catch points are possible to ensure that the spring does not detach from the frame. ●Application These sofa spring repair brackets can be used for spring fixing, whether it is a seat, a backrest spring such as a sofa, a car seat, etc. ●Material: these spring clamps are made of metal and each clamp is insulated by a plastic sleeve. It is a good silencer. ●Features: These springs provide a high level of support, allowing the springs to be installed safely and firmly. This is the best spring clamp for attaching the sofa. ●What you will get:20pcs spring clips for upholstery, enough to meet your needs.