Spool Cap Specification - Compatible with Black+Decker spools, 20 ft of 0.080 in line; works with original spools SF-080 and SF-080-BKP; cap covers model 90583594. Compatible models - Cap is compatible with Black+Decker weed eater string trimmer caps GH3000, GH3000R, LST540, and LST540B. Professional CNC winding spool Cap - Designed for Greenworks spools produced by CNC winding with automatic line change. - Eliminates the need for manual winding, which can be cumbersome, prone to sticking, and may cause damage to the string trimmer. Rugged material - Construction uses a high-quality ABS spool body and durable polyamide nylon line. - The material is flexible and long lasting. - Design leverages centrifugal force and aerodynamics to reduce drag and support fast, efficient cutting. Key benefits and use scenarios - Easy compatibility across popular brands and models, reducing downtime when replacing spools or caps. - Versatile performance for Black+Decker and Greenworks spools, enabling smooth line feeding and automatic line change where supported. - Durable construction for reliable operation in everyday yardwork and professional applications. - Ideal for edging along driveways, sidewalks, fences, and garden beds where quick line changes and consistent cutting are valued. - Suitable for landscapers and homeowners who require a dependable, long-lasting spool cap that supports fast cutting with reduced maintenance.