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.
Quantity: Tripod Mount Ring x 1
The third party special design, perfect conformity in color and surface qualities.
Ring inner diameter: 81.5mm, Ring width: 18mm, Ring thickness: 4.5-8mm, Color: White
Made by metal with very high quality
Suitable for Canon EF 70-300mm f/4-5.6L IS USM.
The UNC (Unified National Coarse Thread) is 1/4" and 3/8".