Compatible Model: AF 100 replacement spool compatible with most BLACK+DECKER auto-feed trimmers: BESTA510, BESTA512, BEASE620, CST1000, CST1200, CST2000, GH400, GH500, GH600, GH610, GH900, GH912, LSTST. 120, L ST136, LST140, LST201, LST220, LST300, LST400, LST420, LST522, LST1018, LSTE522, LSTE523, LSTE525, NST1018, NST1024, NST1118, NST1118, NSTST1118, NSTST1118, NST1118, NSTST1118, NST1118, NST1118, NST1118, NSTST11810. NST2018, NST2118, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000. Replaces spool model AF-100, AF-100-3ZP, AF-100-BKP. Great Value: Package comes with 3 auto feed spools. Get a 3 pack of weed eater string at a fair price for the quantity provided. Much cheaper than branded weed eater string. With 3 replacement spools, it lasts for multiple seasons of use. Heavy Duty Weed Eater String: Made from heavy duty nylon, this af100 trimmer line offers exceptional strength and durability. The 0.2cm diameter high strength nylon line ensures fewer breaks and it won't snap like cheaper ones. Efficient Grass Cutting: Enjoy reliable auto feed functionality, eliminating the need for manual line feeding. This AF-100 spool cuts grass a little faster, effortlessly tackling field weeds. Easy to install: simply thread it through the hole, push the spool down, insert the spool into the bottom slot, cover the cap, and press down until it locks.