Upgrade your lawn care with our premium 30ft replacement spool, specifically designed for compatibility with a wide range of Black&Decker string trimmer models including GH400, GH500, GH600, GH610, GH900, LSTE525, LST300, BESTA510, and many more. This high-quality trimmer line features a 0.065-inch diameter, providing a durable and efficient cutting experience. The 30 feet length allows for an extended mowing area, while the wear-resistant polyamide nylon thread ensures a longer lifespan and reliable performance. Our AFS automatic feed spool utilizes centrifugal force and aerodynamics to minimize drag, enabling fast and efficient cutting. The robust ABS weed wacker cap securely holds the spool in place during operation, ensuring stability and reliability. Enjoy hassle-free installation with our snap-in design, allowing for quick and tool-free replacement. With professional CNC machine cutting and automatic winding, this spool is designed for efficiency, reducing the risk of damage and preventing tangles while mowing. Perfect for maintaining a pristine lawn effortlessly.