Dual ring. Holds coffee mugs with a handle, 12-ounce cans, or drink insulators. Mounts quickly and easily on boats or RVs. Flip the small ring up to hold small drinks. For large drinks, flip the small ring down and use the large ring. When not in use, flip rings down and close the cover for convenient storage. Closed depth of just 7/8". Four holes for #10 screws. Polycarbonate construction.