Features: Lens collar support is specially designed for RF 100-500mm F4.5-7.1L IS USM lens. A great replacement for the original RF 100-500mm F4.5-7.1L tripod mount USM lens. Made of high-quality aluminum alloy material, with anodizing, precision CNC machining, lightweight hollow design, vibration polishing technology, improving metal surface hardness and uniformity by 20%, durable. The inner wall of the tripod ring mount is irregularly structured and fits the lens perfectly. The plastic film ensures the lens surface won't be scratched. The metal plate length is about 55mm, with a built-in camera quick-release plate for tripod heads, equipped with 1/4" and 3/8" screw holes. The bottom is a standard RRS interface plate, compatible with RRS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE ball heads. Specifications: Material: Aluminum alloy Color: Black Plate Length: Approx. 55mm/2.16", with 1/4" and 3/8" screw holes Applicable Model: For RF 100-500mm F4.5-7.1L IS USM lens Note: Please allow 0-1cm error due to manual measurement. Please make sure you don't mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 Piece Lens Tripod Mount Ring Base