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 trimming and edging. 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 mowing range. Easy to use and install: Snap into place for quick and effortless replacement without tools. Auto-feed spool uses centrifugal force and aerodynamics to reduce drag and enable 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 suitable only for young grass. For strong weeds, use other tools such as blades. Color: Black + Blue + Green. Material: ABS, Nylon. Package Contents: 6 * String Trimmer Spool Line, 2 * Cap Cover. Only the above package contents are included; other products are not included. Note: Lighting and display differences may cause the color in the image to vary slightly from the actual item. Measurement may vary by +/- 1-3 cm.