Wedge kit for 0-4 degree angle adjustment - 7 diameterWhile underway, the bow of your powerboat tends to ride at an elevated angle, causing your radar to be angled. With Edson's 67550 0-4 degree Wedge for Round Base Vision Mounts the elevated bow will be offset aligning your radar to see better. Edson's 0-4 Degree Wedge requires an Edson Mounting Plate and an Edson Vision Series Mount. Specifications:Base Mount and Mounting Plate sold separately**NOTE: ONLY COMPATIBLE with Vertical Round Base Vision Series Mounts (68930, 68900, 68770, 68910, 68730, 68740)**