Jim Black Boat Deck Hatch / Door 581-1320-05 | 13 x 20 White Poly Manufacturer: Jim Black; Manufacturer Number: 581-1320-05 Material: White Glass Filled Polypropylene; Overall Dimensions: 20" L x 13" W x 1 3/8" D Cutout: 17 1/4" x 10 1/2"; Opening: 16 1/4" x 9 1/2" Sold as seen in pictures; Note every computer shows colors differently; All measurements are approximate; Hardware and instruction/installation manual not included.