Dog Door for Walls -XL Dogwalk Wall Mount Dual Flap Dog Door 14" X 23.5" Durable white aluminum frame. Picture frame style Virtually indestructible Dual flaps made from Bayer Plastics Security slide to close off door completely Self framing wall tunnel - Dogwalk's tunnel requires no cutting or assembling XL 14 1/8 x 23 5/8 Opening