Fotasy NTR1 Metal Tripod Collar Mount Ring and Cleaning Cloth for Nikon AF-S NIKKOR 70-200mm f/4G ED VR Lens (Black) The metal 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. Fits Nikon AF-S NIKKOR 70-200mm f/4G ED VR lens, Replaces Nikon Tripod Collar Mount Ring RT-1 Weight: 5.5 Oz, Size: 15.5 x 7.5 x 6.5 / 6.1" x 3.0" x 2.6" Fotasy is a registered trademark