The tripod mount ring is designed for Canon EF 70-200mm f/4L USM Lens, Canon EF 70-200mm f/4L IS USM Lens, Canon EF 70-200mm f/4L IS II USM Lens, Canon EF 400mm f/5.6L USM Lens, and Canon EF 80-200mm f/2.8L Lens. The lens collar is based on Canon's original design with enhancements including improved bearing performance, refined details, and integrated quick release plate functionality. Constructed using high temperature die-cast metal with CNC processing and a surface finish similar to car paint. Features an internal protective film, copper knob, and stainless steel anti-slip pins. The lens support bracket has an inner diameter of approximately 65.5mm and width of 18mm. It features a split structure with a 60mm long quick release plate at the bottom equipped with 1/4 inch and 3/8 inch threaded screw holes. The bottom of the lens holder includes a 39mm Arca-Swiss compatible quick release plate, compatible with RRS, Arca-Swiss, Wimberley, PMG, Sunwayfoto, Benro, Sirui, Marsace, and Ishoot tripod ball heads that support Arca 39mm standard. Color: Creamy-white Material: Metal Package Contents: 1 x Tripod Mount Ring Note: The package includes only the items listed above. Other accessories or products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error tolerance is +/- 1-3cm.