1.Fitment: CMZST0653 Replacement weed eater blade kit fits for Craftsman trimmer CMCST900 CMESTA900 CMESTE920 CMCST98020 CMEST913 CMESTHOS912 2.Quality Materials: The trimmer head of ACFHRL2 weed eater is changed to nylon material, which will be more durable; the plastic blades have the advantage of being more durable and cutting faster than trimmer line; and the weed eater spools are made of high quality ABS spools and upgraded nylon polyamide material, which is flexible and elastic, and can be stretched and cushioned on hard surfaces 3.Product Includes: 10 packs of polycarbonate blades + 4 set screws + 4 CMZST065 trimmer spools+ 1 pack of trimmer heads+ 1 pack of tool wrenches 4. Easy Installation: simply push this trimmer head into the stringer socket and it automatically locks in place with assistance from the side push buttons, and it does not need an adapter 5.Best Use: Plastic Blades: only suitable for cutting weeds on a horizontal surface. Avoid using plastic blades around hard objects as they break easily. Spools: When vertical cutting is required, we recommend that you replace the trimmer blades with a trimmer spool Rivershine CMZST065 Replacement Trimmer Blades Head and CMZST065 Replacement Trimmer Spool Compatible with Craftsman Trimmer CMCST900 CMESTA900 CMESTE920( 1+ 10+ 4+ 4) 1.Fitment: CMZST0653 Replacement weed eater blade kit fits for Craftsman trimmer CMCST900 CMESTA900 CMESTE920 CMCST98020 CMEST913 CMESTHOS912 2.Quality Materials: The trimmer head of ACFHRL2 weed eater is changed to nylon material, which will be more durable; the plastic blades have the advantage of being more durable and cutting faster than trimmer line; and the weed eater spools are made of high quality ABS spools and upgraded nylon polyamide material, which is flexible and elastic, and can be stretched and cushioned on hard surfaces 3.Product Includes: 10 packs of polycarbonate blades + 4 set screws + 4 CMZST065 trimmer spools+ 1 pack of trimmer heads+ 1 pack of tool wrenches 4. Easy Installation: simply push this trimmer head into the stringer socket and it automatically locks in place with assistance from the side push buttons, and it does not need an adapter 5. Best Use: Plastic Blades: only suitable for cutting weeds on a horizontal surface. Avoid using plastic blades around hard objects as they break easily. Spools: When vertical cutting is required, we recommend that you replace the trimmer blades with a trimmer spool