Compatible with string trimmer models for BLACK+DECKER: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118, LST220, LST300, LST400, LST420, LST136
Included: 4 pack replacement spool cap covers for BLACK+DECKER Electric Trimmers
Tool-free spool cap
It protects the line and holds the spool in place
Free warranty -- 3 years warranty