This attractive dog door is designed to fit all doors and panels of wood, metal and pvc construction. Because of it's tunnel profile it will fit all doors and panels from 3/8" - 2" thick. This pet door is simple to install and has a weather seal flap to reduce drafts. All screws are stainless steel, avoiding potential rust stains on door panels. The flap size is generous, 7 1/8" x 9 1/2" - large enough for pets up to 12 pounds.