Perfect Fit: BestEvMod Second Row Seat Back Anchor 17mm Ball Head compatible with Rivian R1T & R1S is designed according to 3D laser scan to make sure it fits your Rivian perfectly. High Quality Material: Made of high-quality, injection-molded ABS material, it is sturdy, wear-resistant, and easy to clean. Function: The 17mm Rotatable Ball Head and 1/4" Standard Female Thread Screw Hole can be used to mount various devices such as cameras, smartphones, GPS units, and other compatible accessories. Please Note: this product only includes the 17mm ball head and the mounting base. Easy to Install: Please follow our 4th product image to install it. Screws are included in the package. Service: We are committed to providing customers with better product and service. If you have any problem with our product, please feel free to contact us at any time and we will try our best to guarantee you are 100% satisfied. BestEvMod Seat Back Second Row Anchor 1/4 Screw Mount Phone Holder Tablet Compatible with 2022-2025 Rivian R1T&R1S Backseat fits All Phones&Android 360° Adjustable