Features: The lens collar holder is specially designed for the RF 100-500mm F4.5-7.1L IS USM lens. Perfect replacement for the original RF 100-500mm F4.5-7.1L tripod base USM lens. Made of high-quality aluminum alloy material, using anodizing, precision CNC processing, lightweight hollow design, and vibration polishing technology to increase the metal surface hardness and uniformity by 20%, making it strong and durable. The inner wall of the tripod ring bracket has an irregular structure and fits perfectly with the lens. The plastic film ensures that the surface of the lens will not be worn. The plate length is about 55mm. The tripod camera quick release plate is built into the head and is equipped with 1/4" and 3/8" screw holes. . The bottom comes standard with an RRS interface quick-release plate, suitable for RRS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE gimbals. Specifications: Material: Aluminum Alloy Color: Black Plate Length: Approximately 55 mm/2.16 inches, with 1/4 inch and 3/8 inch screw holes Applicable models: Suitable 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 differences between monitors, images may not reflect the actual color of this item. Packing list: 1 piece lens tripod mounting ring base