Double Drink Holder sized to fit can drinks with insulated sleeves and many mugs. Interior Dimension 3.625”(2.9” at narrowest point)x7.85”. Overall Height 3.86”. Cutout on top ring can be useful for hanging sunglasses, etc. Mounts permanently to 1 ¼” square rail commonly found on pontoon boats. No drilling required. All mounting hardware included. Color: White.