Bi-Directional Body Plate for the Nikon D 300(s) and D700 ARCA compatible and Bi-Directional to allow mounting the camera aligned with the optical axis or perpendicular to it. You will not need to reposition the head to change from a collared lens to an un-collared lens. Sculptured to conform to the unique shape of the D 300/D700. It mimics the contours of the camera and prevents rotation by matching the camera's footprint. Mounts with the standard 1/4-20" screw in the camera. Wrench provided. Weight: .9 ozs.