Replacement BLACK+DECKER AF-100 cover. 1. [Design] Replacement coil cover is easy to replace and perfectly compatible with the BLACK+DECKER RC-100-P trimmer. Includes 4 cutting caps and 4 springs to meet daily replacement and storage needs. 2. [Function] Replacement bobbin cover designed for use with thread cutter and AFS automatic thread delivery bobbin system. 3. [Advantages] Made with advanced production technology for long service life, stable performance, and high reliability. Ideal replacement for damaged or worn parts. Suitable for gardening and yard maintenance. 4. [Easy] Simple installation process helps extend the life of your trimmer without the need for a full replacement. Ideal for use on patios, lawns, yards, gardens, and landscaped areas. 5. [Practical] Specially designed to withstand wear on rough surfaces. Aerodynamic design helps reduce line vibration and noise during operation.