The tripod mount ring is specially made 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, EF 80-200mm f/2.8L Lens The lens collar is referencing to and modified from original standard design, bearing is enhanced, details are improved, and added the features of quick release plate High temperature die casting molding of metal, CNC processing, car paint on . Built-in film, copper knob and stainless steel anti-skid nails The this lens support bracket inner diameter is about 65.5mm, width is about 18mm; split-structure, bottom is 60mm length quick release plate, with 1/4inch and 3/8inch screw holes The lens holder bottom is 39mm Arca fit Quick Release Plate, Compatible with / Arca / / / / / / MARSACE / tripod ball of Arca 39mm fit colour: creamy-white Material: metal Package Contents: 2 x Tripod Mount Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. The lens holder bottom is 39mm fit Quick Release Plate, Compatible with / / / / / / / MARSACE / tripod ball of Arca 39mm fit The tripod mount ring is specially made 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, EF 80-200mm f/2.8L Lens The this lens support bracket inner diameter is about 65.5mm, width is about 18mm; split-structure, bottom is 60mm length quick release plate, with 1/4inch and 3/8inch screw holes The lens collar is referencing to and modified from original standard design, bearing is enhanced, details are improved, and added the features of quick release plate High temperature die casting molding of metal, CNC processing, car paint on . Built-in film, copper knob and stainless steel anti-skid nails