Lock Ring for Olympus M.Zuiko 150-400mm f/4.5 TC1.25x IS PRO lens.

A lock ring is included with every lens hood order if required by the lens hood.
Lock Ring for Olympus M.Zuiko 150-400mm f/4.5 TC1.25x IS PRO lens. Compatible with Zemlin Photo HZ-O115 Series Hoods. Approximate weight: 27g. Order only as a replacement or if using a hood on multiple lenses.