Introducing the Four Winns Boat Fishing Rod Holder 032-2970, standing at 28 1/4 inches and finished in sleek black. Crafted from durable marine-grade plastic in black and white, with a black vinyl bottom, this holder measures about 3 3/8 inches in outer diameter and has a flange height included in the overall height. It features (2) 1/4-inch diameter countersunk mounting holes and has an inner dimension of 2 1/2 inches.