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. About shlpping: All items will be shlpped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we"ll make you feel satisfied.