This is a plug intended to eliminate the trip hazard hole that is present on the deck of many Bennington Pontoon boats. The hole is present for accessories like tables, cover poles, etc, and measures 60mm or 2.4 inches in diameter. When not in use, this plug caps it off, leaving a smooth and attractive finish, and reducing the inevitable trip hazard that is the usual hole in the floor. They are sold in packs of 2. Note: This listing is for the plug that goes in the center of the metallic mounting plate, and does not include the mounting plate itself.