Just the basics here - if you want to hold a couple of cans or bottles on a vertical surface like the side of your console or bait tank, this cup holder is what you need. It attaches with a powerful-yet-simple-to-use SeaSucker 4-1/2 Inch vacuum mount, which means you can put it where you need it, when you need it. The cup holder inserts remove for easy cleaning and can be swapped out for our Small Dry Box for safe keeping of cell phones and other items you don't want to get wet.