Precision Fit for USB Lithium Models – Designed specifically for Compatible with Ryobi’s USB Lithium line (excluding Tek4, FVL51 & FVL56), ensuring proper fit . Protects Your Battery – Keeps dust, debris, and moisture out of your battery compartment to extend tool life and maintain performance. Easy, Installation – Screws on quickly and securely with no need for special tools, so you can get back to work faster. Durable, Long-Lasting – Made from high-quality materials to withstand job site wear and tear without cracking or loosening over time. **TOOLS OR BATTERIES NOT INCLUDED** Restore functionality to your compatible with RYOBI USB lithium power tools with this secure-fit battery replacement cap. Ideal for tools with a missing or worn-out cap, this non-OEM part helps ensure your battery stays in place for safe, consistent performance. (excluding Tek4, FVL51 & FVL56) **TOOLS OR BATTERIES NOT INCLUDED**