FITS MODELS - Compatible with multiple Black and Decker string trimmer models: GH400, GH500,GH600, GH610, GH900, LSTE525, LST300, BESTA510, LCC340C, LST522, ST8600, ST7700, ST7000, ST6600, NST2118, NST2018, NST1118, NST1018, MTE912, MTC220, LSTE525BT, LSTE523, LST420, LST400, LST220, LST201, LST140C, LST136W, LST136B, LST136, LCC222, LCC221, LCC140, GH912, GH610, GH500, GH400, CST2000, CST1200, CST1000, BESTE620, BESTA512. Compatible with Spool model:AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. SPOOL SPECIFICATION - 30ft 0.065 inches line replacement spool compatible with Black and Decker original spools models AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. Length 30 feet trimmer line provides a wider range of mowing area. 0.065 inches diameter wearable line supports fast cutting and longer lifetime. RUGGED MATERIAL - Premium quality AFS automatic feed spool and durable polyamide nylon thread, pliable and flexible and long service life. Use centrifugal force and aerodynamics to reduce drag and achieve fast cutting. The high quality ABS weed wacker cap replacement is tough enough to fix the spool tight and keep safe during mowing. CONVENIENT AND TIME-SAVING - Snap into place for quick and effortless replace without tools. Professional CNC machine cutting and automatic winding is safer and more time-saving than manual winding, reduces damage for string grass trimmer and not get stuck when mowing. PRECAUTIONS FOR USE Wear safety goggles and long pants when using this product to avoid injury from spilling lines. Unplug tool before changing, installing, or removing accessories. This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim.