Keep that handheld VHF radio or GPS receiver safely in reach at the helm with this popular radio holder. Opening is oval in shape with the Interior Dimensions at widest point being 3.15" x 1.8" with additional clearance of for belt clip on the top ring. Overall Height 5". Order to fit specific tubing size. Designed to be easily moved to different locations on the boat and stored below to avoid theft. Rotate clockwise to snap to tube and counter clockwise to remove.