Product Can be replaced BLACK+DECKER AF-100 cover. 1. [Design] The replacement spool cap is easy to replace. Perfectly compatible with the BLACK DECKER RC-100-P trimmer. 4 or 6-piece cutting caps and 4 or 6-piece springs meet your daily needs for replacement and storage. 2. [Function] Replacement lid for the replacement spool, for use with line trimmers that use an automatic AFS feed spool. 3. [Advantages] Advanced production technology and longevity. Stable properties, high reliability.Perfect replacement for the defective part.Perfect for the garden or agriculture. 4. [Easy] Easy to install and saves you from buying a new trimmer. Ideal for terraces, lawns, courtyards, gardens, crops, landscaping, landscapers, etc. 5. [Practical] Specially developed to last longer on edges against rough surfaces. The aerodynamics reduce the noise and the flutter of the cables. Package Included: 4 x Replacement Spool Cap Cover + 4 x Spring 6 x Replacement Spool Cap Cover + 6 x Spring