Just the basics here - if you want to hold a couple of cans or bottles on a horizontal surface like the top of your console, cooler or bait tank, this cup holder is what you need. It attaches with a powerful-yet-simple-to-use SeaSucker vacuum mount, which means you can put it where you need it, when you need it. It can hold up to 2 cans, water bottles or 24 oz. Tervis tumbler.