SunwayFoto DPG-50R 50mm Universal Quick-Release Plate for Arca-Style and RRS Clamps Arca & Really Right Stuff Lever Clamp compatible Square base mounts in both axis's allowing 90 re-mounting of camera Precision CNC machined from solid aircraft-grade aluminum. Suitable for the cameras with bottom width of about 50mm Includes 2 allen wrenches and 1/4" hex screw & 2 safety stop hex screws