Hatch Round Bomar All Wht 20In Specifications: "P" Style Internal Hinge. Color: White, Translucent Glass. To suit Hatch Surround Round 20" Dimensions: Height (deck to lid): 15⁄16", Cut out: 20 15⁄16", Deck Flange: 21 15⁄16", & ; Lid: 22 7/8".