Quad Drink Holder sized to fit can drinks with insulated sleeves and many mugs. Mug Opening Diameter 3.625”. Interior Dimension 3.895x8.12”. Overall Height 3.86”. Overall Width 18.4”. Cutouts on top ring can be useful for hanging sunglasses, etc. Flush mount unit not suited for use in combination with P0011 tables. Mounts permanently to 1 ¼” square rail commonly found on pontoon boats. No drilling required. All mounting hardware included. Color: White.