SeaSucker Universal 1-Cup Holder Black. ) these days wasnt enough to stump Seasucker's design team on this one. The Universal 1-Cup Holder has the range to hold just about everything thanks to its 4in opening. This cup holder uses a set of rubber flaps in the opening to keep your drink from flopping around and they provide just enough friction to keep your drink from bouncing right out of the cup holder in rough seas whether it's a tiny 2in diameter can of Red Bull to a jumbo 3.75in diameter 40oz. can of Schlitz (CLASSY). To top it all off it has a tool-free mechanism to easily change the vacuum mounts orientation from vertical to horizontal to 45 degrees which makes just about any rigid smooth surface on the boat suitable for mounting. Specifications for SeaSucker Universal 1-Cup Holder: Manufacturer: SeaSucker Size: One Size Package Contents: SeaSucker Universal 1-Cup Holder SeaSucker MC5316B: Universal 1-Cup Holder Black