This holds two drinks in "coozie" insulators, and also many sizes of bottled water. Don't bother drilling holes in your boat, you can simply attach and remove this drink holder by using suction cups (included). To add to the versatility a free 4 oz. spray bottle is included. The spray bottle is perfect for cleaning salt spray from prescription lenses. The same spot may also be used to store 3 & 4 oz. sunscreen tubes if desired.