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”X1.8” with additional clearance of ¼” for belt clip on the top ring. Overall Height 5”. Includes UniClamp that fits a wide range of tubing diameters from 3/4" to 1 3/8". Also offers the option of bulkhead mount. Designed for permanent mounting.