Pet-tek Small Dog Door with Tunnel - Overall Size: 12 3/4" x 9 7/16"- Brown - PT-DB Flap size 7 1/8" x 9 1/2" - For pets up to 35 pounds Fits doors from 3/8" - 2" thick - Overall size: 12 3/4" x 9 7/16" Available with Brown or White frame - UV Stabilized Virtually unbreakable flap using Bayer Polycarbonate All Stainless Steel screws to prevent rusting. No maintenance required