Extra security for your RotopaX containers. Mount to any flat surface, place container on mount, align with container "dimples," and turn until tight. Our unique DLX handle design gives more turning power to keep containers tight against their mounting surface. Insert the Lock cylinder for security against theft while out on your adventure. If you are using this mount with an extension, it will defeat the purpose of the locking capability. 4" x 1" x 3 3/4"