The Removable Suction Base for Downwind Sail simply attaches to most smooth-finished hard-shell kayak decks. Simply press the suction cups down firmly to attach the plate, then attach your sail. For the best results, it is always best to clean the mounting surface before you attach the suction cups. When you don't have the itch to go sailing, the Removable Suction base for Downwind Sail can also have rod holders attached to it to quickly turn your kayak into a fishing kayak!