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 and flexible and long service life.Size: Cordless grass trimmer spool line diameter 0.065 inch to fits line hole perfectly. Spool line length 16ft provide a wider range of mowing.Easy to use and install: Snap into place for quick and effortless replace without tools. Utilizes centrifugal force and aerodynamics to reduce drag and achieve fast cutting. Pre -wound spool saves you time and energy.Precautions for use: Wear safety goggles and long pants when using this product to avoid injury from spilling lines. This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim.Material:ABS, nyloncolour:black+blue+greenPackage Contents:4 x String Trimmer Spool Line1 x Cap CoverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.