Boat Cup Marine Drink Beverage Holder, Clamp on for Angled Boat Pipes Cuda's Customs Custom Clamp-on Marine Boat Drink Holder, Small Cup fits Bottle With Koozie, Large Cup fits Can With Foam Koozie or a 24 ounce Tervis Tumbler. Add no holes in your boat but more drink holders. Tough and durable part made of UV protected marine starboard and marine grade stainless allen head screws. Starboard is a marine grade polymer that is stabilized to resist saltwater, chemicals, and UV damage. It will not rot or delaminate, it retains its original color indefinitely, doesnt require refinishing, and has a scuff resistant surface that cleans quick and easy. Each holder Custom Made for All Sizes of Angled Pipes on Your Boat. Rotates 360 degrees without damaging pipe beneath. Cup inserts are removable for cleaning and/or replacing. Check Amazon for more Cuda's Customs Clamp-on Drink Holders for horizontal and vertical boat pipes .