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. PRODUCT SPECIFICATIONS: Ring breadth: 17.8mm Ring thickness: 6.1mm Color: black Material: metalThe UNC (Unified National Coarse Thread) is 1/4 Package Included: Tripod Mount Ring x 1 Suitable For: Nikon AF-S NIKKOR 70-200mm f/4G ED VR lens