Replacment foot for Nikon AF-S 500 mm f4 VR A highly sculptured full replacement foot; just long enough to cover the balance point, Sculptured to fit close to the lens while still allowing room for fingers. Has a double cut dovetail to accommodate flash arms using the ARCA style mount. Improved balance for ball heads and action heads because of a 2.7" offset from the lens center. ARCA compatible like all 4th Generation Designs products. Wrench provided. Weight: 3 ozs.