Bi-Directional Body Plate for the Canon 1D Mk II series Mount the camera in either direction because of our unique bi-directional design. Fully ARCA compatible like all 4th Generation Design plates. Switch from collared lenses to un-collared lenses without repositioning the tripod head. Sculptured to match the curvature of the camera base and carefully machined to be smooth to the touch. Notice the feathering of the front alignment contour. Mounts with the standard 1/4"-20 screw. Wrench provided. Weight: 1.2 ozs.