MC5307SeaSucker Fisherman's Cup Holder Model: MC5307 This perennially popular cup holder does so much more than keep your cans and bottles where you can reach them. It's also a mini tackle-rigging station with the ability to hold a pair of pliers, a knife, a couple dozen hooks and lures, and whatever else you can fit into the 2.75" diameter cup in the middle. Like all of our cup holders, it attaches with a powerful-yet-simple-to-use SeaSucker vacuum mount, which means you can put it where you need it,