Black and Decker AF-100-3ZP 30ft 0.065" Line String Trimmer Replacement Spool, 3-Pack Fits multiple string trimmer models: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118, LST220, LST300, LST400, LST420, LST136 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