Description??[Fits multiple Black + Decker string trimmer models]:LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, CST1200, CST2000, MTC220, MTE912, NST1018, NST1024, NST2018, NST1118, NST2118, LST120, LST136, LST140, LST201, LST220, LST300, LST400, LST420, LST136, LST522, LST1018, LST523, LST525, BESTA510, BESTA512, BESTE620[Compatible with Black + Decker Trimmers]: Designed for use with Black & Decker auto feed string trimmers, 30-foot factory-wound replacement spool features a 0.065-inch diameter line.[Auto Feed System Replacement]: Eliminates time spent hand-winding string trimmers, compatible with Black+Decker string trimmer and utilizes centrifugal force to feed the trimmer line as it is needed.[Enhanced material]:Premium 0.065-Inch diameter enhanced nylon line, supports fast cutting and longer lifetime. (