Compatible with 10-15 inch trimmers - Designed for a wide range of trimmer models: 51256, 51301, 51302, 51303, 51304, 51305, 51307, 51308, 51309, 51324, 51326, 51331, 51333, 51334, 51335, 51350, 51353, 51443, 51444, 51445, 51446 and 51465 trimmers. - Stable replacement spool: 0.65 inch diameter and 9 m long replacement thread trimmer spool, a perfect fit and optimal performance. - Easy installation: pre-wound spool requires no tools, saves you effort during installation. - Reliable cutting performance: provides reliable cutting performance and ensures efficient trimming. Use scenarios - Maintain clean edges along driveways and sidewalks with quick spool replacement during routine lawn care. - Trim around garden beds, trees, and shrubs where precise control and consistent line feed matter. - Clear tall weeds and overgrown areas along fences or property boundaries with minimal downtime thanks to a ready-to-use, pre-wound spool.