Tripod Mount Collar Ring A(B) for Canon EF 80-200mm f/2.8L USM EF 70-200mm f/4L USM EF 200mm f/2.8L USM  EF 400mm f/5.6L USM Introduction The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera. right weight and strong building by third party. 100% fits Canon and does have same construction. PRODUCT SPECIFICATIONS: Ring diameter: 66mm Ring thickness: 3mm Color: black Made by metal with very high quality The UNC (Unified National Coarse Thread) is 1/4 Quantity: Tripod Mount Ring x 1 Brand new, never used Suitable For Canon EF 80-200mm f/2.8L USM Canon EF 70-200mm f/4L USM Canon EF 200mm f/2.8L USM Canon EF 400mm f/5.6L USM Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.