Feature Highlights: 1. Each spring features a backbend design at both ends, ensuring secure attachment and preventing accidental detachment. The machine-cut finish ensures uniform and precise shaping. 2. Accurate and stable in size, with clean-cut edges for smooth operation—no friction, no rust, and long-lasting durability. 3. This sofa spring repair kit is specially designed for attaching herringbone bent, non-backslotted springs to upholstered furniture wood frames, ideal for use as seat or backrest springs. 4. Made from carbon steel, each spring is shaped and heat-treated to deliver excellent elasticity and toughness for reliable support. 5. Springs are constructed with a 48mm high bow position and a 25mm short pitch, equipped with stock feet for enhanced stability and weight distribution. Product Details: This serpentine spring replacement kit provides a durable and efficient solution for repairing or upgrading sofa and chair seating. The high-quality carbon steel springs are engineered for consistent performance, with a backbend design that prevents slipping and ensures secure installation. Each spring is precision-cut to maintain accurate dimensions and a smooth, rust-resistant surface. Easy to attach to wooden frames, the kit is ideal for DIY furniture restoration, offering improved support and comfort with its optimized bow height and pitch design. Specifications: - Spring Type: Serpentine/herringbone bent, non-backslotted - Material: Carbon steel (heat-treated) - Spring Height (Bow Position): 48mm - Pitch: 25mm - Design Features: Backbend ends, stock feet, machine-cut edges - Included: Set of springs with clips (compatible with 50 cm serpentine spring applications)