Dimensions: 3-1/2" H - 3 1/2"ID, 4 1/8" OD, with flange.Bottom of Cup Outside Diameter: 2.86 inches(7.27cm)；With 0.12"ID (0.28" OD) drain holes in the bottom to keep moisture away. Fit a variety of glass and canned containers.But the Yetis and tumblers do not fit this, botton is smaller that does fit perfect for 12 oz cans or solo cups,or 20oz soda or water bottle. The drain port makes it extremely convenient. Run water or rain down from the drain port to the outboard side of the boat and there's no more worrying about having to empty out the cupholders every time it rains or someone spills. No Mounting Screws Required Smooth Finish For Easy Clean Up Install almost anywhere on boat, game table, sofa, car,RV, table, counter top, dashboard, seatback,etc.
Details:

Use these sturdy and deep cup holders to add additional drink holders to the boat and rv.They would also fit the recliner drink holder.Amarine Made cup holders fit perfectly into a bracket for a center console,gaming table,couch table,DIY bench,ice shack seating,etc.

The bottom circle is the size of a can of pop or a bottle of beer. If you use plastic double walled cups with a screw on lid and a straw then you need to buy them with a small bottom or they will be tippy in there because it has two sizes.

They are great for smaller cups. This product will not fit the larger metal cups 24-32 oz unless they have a super skinny bottom, which most don't.