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Suitable For: SIGMA APO 70-200mm F2.8 II EX DG MACRO HSM 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. Made by metal with high quality and strong building. The UNC (Unified National Coarse Thread) is 1/4" Ring diameter: 71mm; Ring thickness: 4.5mm