Suitable for most lawnmower 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. Premium Trimmer Cord: The 9.15m trimmer cord can provide a wider mowing range, with a diameter of 1.65mm, the polyamide nylon cord is durable and flexible. Not easy to damage, ensuring continuous operation. Fast and Clean Cuts: The automatic feed system for changing spools makes the tedious work of manually winding spools much easier. It uses centrifugal force and aerodynamics to reduce drag and achieve fast and clean cuts. PERFECT REPLACEMENT SCOOP: They are a perfect replacement for most original spool models, such as A6481, A6485, AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. Inserting and removing the spool is simple and tool-free. At the same time, damage to the device is avoided and the line is used optimally. GREAT VALUE PACK: