【Compatibility】: Compatible with Ryobi One + AC14RL3A. Suitable for multiple models of Ryobi cordless trimmers: 18V, 24V, 40V. 【Premium Material】: The trimmer spool line - spare wire is made of high quality ABS. Not easy to break supports fast cutting and longer service life. 【Convenience and high efficiency】: Flexible and strong cord for cutting. 【Replacement coil at 【Auto Feed】: Compatible with Ryobi trimmer and uses centrifugal force to feed the trimmer line as needed. 【Package Includes】: 8 packs of trimmer replacement line spools and 2 packs of spare cap covers are packed in a package for you. Spool diameter: φ56*25mm and straw rope: 3.3M*φ1, 65mm replacement spool. Material: ABS and polyamide nylon Three Sizes to Choose Step 1 Stop the motor and brake the plug. Step 2 Replace the spool in the cutting head.< /p> Step 3 Align the retainer with the solt on the outside of the head. Step 4 Cover the cap from the mower. Unplug tool before changing, installing or removing accessories.