Each spring has a back bend design at both ends, the spring is not easy to fall off, the machine is uniformly cut, the size is accurate and stable, the cut is neat, no rubbing, 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 use in a seat or rear spring. Carbon steel spring, after stereotyped heat treatment, has good elasticity and toughness.The spring adopts: 48mm high arch position, 25mm short spacing, with material foot and stronger supporting force. Repair Sagging Cushions -- Our sofa spring repair kit includes all the parts you need to build a new chair or repair a sagging sofa support. Save Money -- Why do you need to replace furniture when you can repair furniture at very little cost? We use these same springs in all commercial and custom furniture.