The Kitty Pass Interior Cat Door Hidden Litter Box Pet Door for cats up to 21 lbs The Kitty Pass is the safest and cutest way to let your cat in and out, of closed doors. Smooth, Wide opening allows your cat to pass through SAFELY, without tails getting snagged or caught up. No eye offending Screw Holes or logos, just beautiful clean lines that compliments your door perfectly. Pass through opening is 7 1/2" wide and 6 1/2" height and can be used by all cats up to 20 lbs. Easily fits all standard interior doors with sizes, 1 1/4" to 1.75" thick Comes completely finished in a beautiful semi gloss white, or you can easily paint it yourself, to match your homes decor.