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 and modified from the original Canon design, with enhanced bearing, improved details, and added quick release plate functionality. Constructed using high-temperature die-cast metal with CNC processing and a car paint finish. Features an integrated film layer, copper knob, and stainless steel anti-slip pins. The lens support bracket has an inner diameter of approximately 65.5mm and a width of about 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 with 39mm Arca compatibility. Color: creamy-white Material: metal Package Contents: 1 x Tripod Mount Ring Note: Light shooting and different displays may cause slight color variations between the image and the actual item. Measurement allows for an error of +/- 1-3cm.