Compatible models: For Greenworks 20v, 24v, 40v, 80v string trimmer models: 21332, 21222A, 21602, 21062, 21132, 21242, 21282, 21312, 21302, 21342, 21262, 2100202, 2100302, 2100702, STBA40B210, ST40B410, BST4000, ST40L00. Spool model: 29252. Cap cover model: 3411546A-6. High quality: High-quality ABS spool and durable nylon string trimmer line. Suitable for grass trimmer and edger use. Pliable, flexible, and long service life. Size: Cordless grass trimmer spool line diameter 0.065 inch to fit line hole perfectly. Spool line length 16 ft provides a wider range of mowing. Easy to use and install: Snap into place for quick and effortless replacement without tools. Auto-feed spool replacement parts for Greenworks use centrifugal force and aerodynamics to reduce drag and achieve fast cutting. Pre-wound spool saves time and effort. Precautions for use: Wear safety goggles and long pants when using this product to avoid injury from flying debris. This cordless weed eater spool refill is only suitable for young grasses. For strong weeds, use other tools such as blades. Color: Black, Blue, Green. Material: ABS, Nylon. Package Contents: 6 x String Trimmer Spool Line, 2 x Cap Cover. Only the items listed are included. Note: Light and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.