The TH-DVTL-55 Dovetail Plate from Really Right Stuff is designed to mount to the bottom of ball, panoramic, and Gimbal-type heads that do not exceed a base diameter of 2.75". The CNC machined 6061-T6 aluminum plate has a black anodized type II finish, and the plate mounts to a head via a 3/8"-16 mounting screw. Additionally, the plate is not completely flat, it has a thin lip around the perimeter of the base. Safety stop screws are located under the plate to prevent accidental detachment from the clamp.