Bi-Directional Body Plate for the Nikon D 200 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 200. It mimics the contours of the camera and prevents rotation by matching the camera?s footprint. Mounts with the standard ?-20? screw in the camera. Wrench provided. Weight: .9 ozs.