[Compatible Models]: Compatible with Lawn Mower; black and decker strings: GH400, GH500, GH600, GH610, GH900, GH912, BestA510, BestA512, Beste620, LST120, LST136, LST220, LST201, LST400, LST300, LST522, LST420, LST522, LST101023, 6, LSTE5023, 6LSTE5023, 6LSTE5023, 6LSTE5023 quality herbage superior with 9.1m\0.065'' cutting line diameter easily cuts through grass and weeds, compatible with original spool models AF-100, AF-100- 3ZP, AF-100-BKP, AF-100-2. [Auto Feed System Replacement]: The trimmer replacement spool is compatible with the trimmer. Black+Decker yarn. The spare spool of the automatic feeding system eases the tedious work of spools. manual winding. [Package included]: 6 BLACK+DCKER trimmer spare spools, 1 spare cap, 1 spare spool spring.