The tripod mount ring is specially 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 modeled after the Canon original 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. It 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 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 plates. Color: creamy-white Material: metal Package Contents: 1 x Tripod Mount Ring Note: Only the items listed above are included. Other products are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3cm.