Features: The lens collar support is specially designed for the 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 the hardness and uniformity of the metal surface by 20%, durable. The inner wall of the tripod ring mount has an irregular structure and fits perfectly with the lens. Plastic film ensures that the lens surface will not be worn. The plate length is about 55 mm, built-in camera quick release plate for tripod head, equipped with 1/4" and 3/8" screw holes. The bottom is a standard RRS interface plate, for RRS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE ball head. Specifications: Material: aluminum alloy Black color Plate length: about 55 mm/2.16", with 1/4" and 3/8" screw holes Applicable model: for RF 100-500 mm F4.5-7.1L IS USM lens Note: Please allow 0-1 cm error due to manual measurement. 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