The tripod mount ring is specially made 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, Canon EF 80-200mm f/2.8L Lens The lens collar is referencing to and modified from Canon 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 surface. 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-Swiss fit Quick Release Plate, Compatible with RRS / ARCA-SWISS / WIMBERLEY / PMG / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT tripod ball head of Arca 39mm fit colour: creamy-white Material: metal Package Contents: 1 x Tripod Mount Ring Only the above package content, other products are not included. Note: Light shooting 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.