Compatible models: For works 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 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 ly. Spool line length 16ft provide a wider range of mowing. 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. cordless weed eater parts refill is only suitable for young grasses. weeds use tools such as blades to trim.Material:ABS, nyloncolour:black+ +greenPackage Contents:4 x String Trimmer Spool Line1 x Cap Cover the above package content, products are not included.Note: shooting 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.