Bi-Directional mounting plate for Nikon D7000 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 D7000. It mimics the contours of the camera and prevents rotation by engaging alignment holes on the camera. Mounts with the standard 1/4-20" screw in the camera. Wrench provided. Weight: .9 ozs.