The RAP-274-1U 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.