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, grass trimmer edger line, pliable, flexible, and long service life. Size: Cordless grass trimmer spool line diameter 0.065 inch to fit line hole perfectly. Spool line length 16ft provides a wider range of mowing. Easy to use and install: Snap into place for quick and effortless replacement without tools. Utilizes centrifugal force and aerodynamics to reduce drag and achieve fast cutting. Pre-wound spool saves time and energy. Precautions for use: Wear safety goggles and long pants when using this product to avoid injury from flying lines. This cordless weed eater parts refill is only suitable for young grasses. For strong weeds, use other tools such as blades. Material: ABS, nylon. Color: black, blue, green. Package Contents: 4 x String Trimmer Spool Line, 1 x Cap Cover. Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowed error is +/- 1-3cm.