Not just a drink holder! This versatile component holds 2 canned drinks with insulated sleeves, 2 mugs, water bottles or binoculars. Interior Dimensions 3.625”(3” at narrowest point) x 7.85”. Overall Height 3.5”. Order to fit specific tubing size. Designed to be easily moved to different locations on the boat and stored below to avoid theft. Rotate clockwise to snap to tube and counter clockwise to remove.