At 4" the CP 42 is long enough to cover the balance point even with lighter cameras. It has a double cut dovetail to accommodate flash arms using the ARCA style mount. Securely mounts to the lens with our superior internal rib system and features our unique "Limit System" providing an improved anti drop function. ARCA compatible like all 4th Generation Designs products. Wrench, mounting, and limit screws provided. Weight: 1.6 ozs.