Compatible with BLACK+DECKER RC-100-P trimmers. This 4-piece set includes trimmer caps and 4 springs designed for regular replacement and backup needs. Engineered to protect the cutting line and securely hold the spool in place, helping your trimmer perform effectively. Constructed from durable metal and plastic materials for reliable stability, shock resistance, and resistance to cold and oil. Suitable for use in patios, lawns, yards, gardens, crops, and landscaping applications. Specifications: Material: Metal, Plastic. Spool Cap Size: 8.5 cm x 3 cm. Spring Size: 2 cm x 1.8 cm. Note: Measurements are taken manually; allow a slight variation of 1–3 cm. Color may vary slightly due to lighting and screen display differences. Actual product may differ slightly from images shown.