Designed for use with Black and Decker auto feed string trimmers, the 20-foot factory-wound replacement spool features a .080-inch/2.0mm diameter line utilizes centrifugal force to automatically feed the cutting string while eliminating bumps and hitches. Fits Black+Decker GH3000 7.5-Amp Electric String Trimmer. Original quality 20 ft./6.1m 0.080"/2.0mm Replacement Line. Factory wound for maximum reliability and less tangling.