Lock Ring for Nikon AF-S Nikkor 600mm f/4D IF-ED II lens.

A lock ring is included with every lens hood order if required by the lens hood.
Lock Ring for Nikon AF-S Nikkor 600mm f/4D IF-ED II lens. Compatible with Zemlin Photo HZ-23 Series Hoods. Approximate weight: 25g. Order only as a replacement or if using a hood on multiple lenses.