Designed for Compatibility: Specifically engineered as a direct replacement for String Trimmer models including P2009, RY15523A, RY15523AVNM, RY40006, RY4CCS, RY251CS, RY251PH, and RY25CSEMC, this head assembly restores efficiency. Part Match: This aligns with part numbers 313318001, 311759008, and 311759013, guaranteeing exact fitment and reliable performance that meets or exceeds the specifications of the original-equipment. Easy Installation: The kit includes all essential components for a straightforward replacement process, allowing you to quickly return to your gardening tasks with minimal downtime. Robust Design & Functionality: Crafted with durability in mind, this withstands regular use while maintaining consistent cutting performance. It facilitates efficient string feeding and trimming, keeping your lawn looking professionally maintained. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Color: As Shown Material: plastic Package Contents: 1 x 1 x Crank handle Only the above package content, other products are not included. Note: Light reflection 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.