The RAP-274-1U consists of the RAM® EZ-ON/OFF™ dual strap base and swivel diamond adapter. Adjust the zip ties for attachment to a variety of rails, from a minimum of .5" / 1.27cm in diameter. With a press of the diamond adapter, the RAM® 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 desired position. The hole pattern found on the diamond adapter will connect to a large variety of RAM® components, including those with the industry-standard AMPS hole pattern.