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 enhanced bearing, improved details, and includes a quick release plate feature. Made from metal using high-temperature die-casting and CNC processing, with 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 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 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 with Arca 39mm fit. Color: creamy-white Material: metal Package Contents: 1 x Tripod Mount Ring Note: Only the above package content is included; other items are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3cm.