This spool is compatible with BLACK+DECKER string trimmers and comes with 20 feet of 0.080in plastic string. It is designed for easy installation and does not require any assembly. The automatic feed system ensures continuous operation while you work on your yard. Whether you need to trim the grass around your garden or reach those tough spots, this spool is perfect for all your needs. It is a high-quality product that delivers superior performance, thanks to its 2-stroke engine with 1 HP horsepower and 500W power. The spool is also designed to last long, so you can use it for your yard work for a longer period.