Replacement spool for models: LST136, LST220, NST2118, ST7700 * Black & Decker replacement spool system eliminates time spent hand-winding string trimmers * Compatible with most Black & Decker string trimmers; 30-Feet replacement line is factory wound for a superior feed * The Black & Decker spool utilizes centrifugal force to feed the trimmer line as it is needed * Includes a 0.065-Inch diameter line * 2-year warranty