The RAP-274-1HU consists of the EZ-ON/OFF™ dual strap base and swivel diamond adapter base. Adjust the zip ties to attach to a variety of rails, from a minimum of 0.5" in diameter. With a press on the diamond adapter the EZ-ON/OFF™ system allows for the quick release of the diamond adapter from the base. When connected, the diamond base can rotate to your optimum viewing position. The hole pattern found on the diamond adapter will connect to a large variety of RAM Mount and third party cradles and mounts, including those with the industry standard AMPS hole pattern. Included is hardware that will attach all RAM cradles, with an AMPS 2-Hole diamond hole pattern, to the RAP-274-1HU.