This Saltwater Marine door is made with a light weight composite construction. Features hidden fasteners stainless steel and plastic latch.. Stainless steel hinge are easy to clean. Doors are made from double sided weatherable gel coat match plastic. Better than Fiberglass doors. Measurements are : Trim- 21″ x 14 1/2″ Doors- 9″ x 11 1/2″ Back opening 17 3/4″ x 11 1/2″ Door can be easily screw mounted to boat. It’s never been used.