Suitable for most Black+Decker mower models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525S.B, GL28LC58LC58LC, STTC582LC505LC, STTC50558 EPC, STC1840, EPC, ST1823, etc. High quality trimmer line: The 9.15m trimmer line provides an extended trimming range with a diameter of 1.65mm. Made from polyamide nylon, the line is durable and flexible, resistant to breaking, ensuring continuous operation. Quick and clean cutting: Features an automatic feed system that eliminates the need for manual spool winding. Utilizes centrifugal force and aerodynamic design to reduce drag and deliver fast, clean cuts. Perfect replacement spool: Designed as a direct replacement for most spool models including A6481, A6485, AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. Tool-free insertion and removal of the valve core allows for easy maintenance. Simple operation helps prevent equipment damage and maximizes line usage. Value package: Includes 6 replacement trimmer spools, 1 spare cap, and 1 spare spring. The cap replaces RC-100-P cap and the spring replaces RC-100-P spring. High-quality components for reliable performance.