Black Plastic Flap Screws (Set of 6) for Insulator Pet Door or 900 Series Patio Door
To determine the correct size door, simply measure the width (A) and height (B) of your pet.
(A) Measure the widest point of your pet's shoulder.
(B) Measure from the top of your pet's back (just behind their head) to the bottom of chest.
Pet door models have different size openings. Just make sure your new pet door's opening is both wider and taller than your pet's measurements to ensure they can comfortably pass through.
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Easy to us use
It is a must have when yo are replace A doggie flap if it has up up for awhile.
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Buy when you replace
Make sure you Buy when you replace your dog door. Last ones I had lasted 10 yrs when I replace the flap. a few broke when we took them off. Not bad for 10 yrs.