1、COMPATIBILITY: Designed for RF600mm 800mm F11 IS STM lenses to ensure perfect compatibility and provide solid support and mounting. 2、MULTIPLE THREADED HOLE DESIGN: The base is designed with multiple 1/4inch and 3/8inch threaded holes, which can be directly mounted to tripods, ball heads, light stands and other equipment, making it easy to adjust the position of the lens and tripod. 3、SIMPLE INSTALLATION: Very easy to install, just align the 1/4inch screws on the base with the threaded holes on the bottom of the lens, rotate the knob into place and secure the lens with the locating pin. 4、FOR ARCA QUICK RELEASE PLATE: Fits standard for Arca quick release plate, which makes it easy to mount the lens to a tripod, ball head, jig or for Arca standard panoramic tripod head. 5、AVIATION ALUMINUM: The camera lens tripod replacement seat is made of aviation aluminum and is CNC precisely machined with anodized surface to ensure product quality and durability.