The tripod mount ring is specially designed for EF 70-200mm f/4L Lens, EF 70-200mm f/4L IS Lens, EF 70-200mm f/4L IS II Lens, EF 400mm f/5.6L Lens, and EF 80-200mm f/2.8L Lens. The lens collar is based on and modified from the original standard design, with enhanced bearing, improved details, and includes a quick release plate feature. Made from metal using high-temperature die-casting molding, CNC processing, and features a car paint finish on the surface. Includes built-in film, copper knob, and stainless steel anti-skid nails. The lens support bracket has an inner diameter of approximately 65.5mm and a width of approximately 18mm. Features a split structure with a 60mm long quick release plate at the bottom, equipped with 1/4 inch and 3/8 inch screw holes. The lens holder base includes a 39mm Arca-compatible quick release plate, compatible with Arca-Swiss style tripod ball heads. Color: creamy-white Material: metal Package Contents: 1 x Tripod Mount Ring Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3cm.