The DPF Flush Series Hatch Door offers an improved design for better water resistance. Handle components and reinforced ribs provide improved stiffness for lifetime durability. This hatch door is impervious to harsh chemicals and petroleum products. The low profile reduces the risk of accidents for a safer boating experience. Features full-length stainless steel hinges and an easy-to-operate handle system. Comes fully assembled, ready for installation.• Outside Dim (Frame): 18-3/4" x 16"• Inside Dim (Access Opening): 15-1/4" x 12-1/2"• Cutout Dim (Installation Hole): 17-1/8" x 14-3/8" Low Profile at 3/8"" above mounting surface 18-3/4"" x 16"" Outside Dim (Frame) 17-1/8"" x 14-3/8"" Cutout | DPI Marine DPF Polar Brite White Flush Series Hatch Door, 18-3/4" x 16" O.D. frame