about this product: Fits Black Decker: Fits most trimmer models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL.4525S.B, GL5028, GL5028SB, GLC1423L, GLC1825L, GLC3625L , STC1820, STC1815, ST4525, ST5530, STC1820PC, EPC, STC1840, EPC, ST1823 etc. Quality Trimmer Line: 9.15m trimmer line can achieve larger mowing range with 1.65mm diameter, polyamide nylon line is durable and flexible. It is not easy to break, which ensures continuous work. Fast and clean cutting: The replacement spool of the automatic feeding system facilitates the tedious work of hand-wound spools. It uses centrifugal force and aerodynamics to reduce drag and make fast, clean cuts. Perfect Replacement Coil: They are a perfect replacement for most original Black & Decker coil models such as A6481, A6485, AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. The coil can be inserted and removed without tools, and the operation is simple. At the same time, damage to the device is avoided and the thread is optimally used. Great Value Package: Package includes 6 spare trimmer spools, 1 spare caps and 1 spare springs. Coil cap replaces RC-100-P cap, spring replaces RC-100-P spring. Excellent value.