Replacement Foot for Nikon 200-400 mm. f4.0 Zoom Lens A highly sculptured full replacement foot; just long enough to cover the balance point, just tall enough for ample finger room. Has a double cut dovetail to accommodate flash arms using the ARCA style mount. Improved balance for ball and action heads because of a 2.9" offset from the lens center. Features our unique "Position Control System" With 6 limit screw positions for an improved anti drop function. ARCA compatible like all 4th Generation Designs products. Wrench provided. weight: 3.5 ozs. (100gm.), height 1.086" (27.5mm.), length 5.383" (137mm.), finger room .787" (20mm.), length of 2nd dovetail 1" (25.4mm.).