General description Perfectly compatible with BLACK+DECKER RC-100-P trimmers, this set includes 4 spool caps and 4 springs, designed to meet your daily replacement and spare needs. These components are specially crafted to protect the line and hold the spool in place, ensuring your machine operates effectively. Technical specifications Material: Metal, Plastic Usage Ideal for patios, lawns, yards, gardens, crops, landscaping, and landscape workers.