Cuda's Customs Marine Boat Cup Holder Universal Clamp-on Mount， Cuda Cup/Smart Double Cup Technology， Weatherproof Cup Holders for Boats， Tree stands， Bikes fits 1 1/2 inch to 2 inch Outside Diameter</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Durable high quality completely weatherproof long lasting universal clamp-on double cup holders</li><li>Universal clamping system， mounts on 1 1/2 to 2" od size range of round & square boat pipework</li><li>Once installed， it will rotate 360 when pushed around pipe but will not migrate down， unless forced</li><li>Smart cup - fits， 20 & 30 oz.， larger tumbler cooler cups & a can with or without foam insulator</li><li>Stabilized to resist saltwater， UV damage， harsh outdoor elements & abuse， comes with slot for pliers</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41z2RUP3t4L.jpg' noproxy></br>