The Ideal Pet “Hefty Kat Door™” with 7-1/2” x 10-1/2” Opening Designed For Large Cats up to 25 lbs! Features Include: Transparent Unbreakable LEXAN® 7 1/2”x 10 1/2” flap with 2-way operation. LEXAN® is a registered trademark of General Electric Rough Cut Out - 8 3/8" x 13 1/2" Outside Frame Dimension - 9 1/2" x 14 1/2" Weatherproof design for Exterior or Interior use. Easy installation. Availability: Usually ships the next business day Ideal ChubbyKat Door IDLHFTKATRegular price: $42.00Sale price: $39.95 Ideal Ideal ChubbyKat Door Door, Large Cat Door, Cat Door for Fat Cats