Suitable for Black & Decker: Fits most trimmer models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525SB, GL5028, GL5028SB, GLC1423L, GLC1825L, GLC3625L, STC1820, STC1815, ST4525, ST5530, STC1820PC, EPC, STC1840, EPC, ST1823, etc. High-quality trimmer line: The 9.15 m long trimmer line with a diameter of 1.65 mm allows for a wider cutting area. The polyamide nylon line is durable and flexible. It does not break, ensuring continuous operation. Fast and clean cuts: The automatic feed system's replacement spool makes the tedious work of manually winding spools much easier. It uses centrifugal force and aerodynamics to reduce air resistance and achieve fast, clean cuts. Perfect replacement spool: These spools are a perfect replacement for most original Black & Decker spool models, such as A6481, A6485, AF-100, AF-100-3ZP, AF-100-BKP, and AF-100-2. The spool can be inserted and removed without tools, making use easy. At the same time, damage to the device is avoided and the threads are optimally utilized. Affordable set: The package includes 6 replacement trimmer spools, 1 replacement cover, and 1 replacement spring. The spool cover replaces the RC-100-P cover and the spring replaces the RC-100-P spring. Excellent value for money.