8 Inch Kayak Hatch Lock Hatch and Storage Bag Kit for canoe boat Overall Diameter :10 inches Hole Cutout Diameter: 8 inch The red bag is removable from hatch Made of special plastic, very durable 8 INCH HATCH NEEDS APPROXIMATELY A 10 INCH FLAT SURFACE TO INSTALL. THE RED BAG IS NOT WATERPROOF. YOU WILL STILL NEED TO USE A DRY BAG OR HEAVY ZIP LOCK TO PROTECT YOUR VALUABLES