Petsafe Staywell Magnetic 4-way Locking Classic Cat Flap (one Size) (white) Magnetic collar key helps keep out strays Easy to install 4 locking options: in only, out only, opened and locked Overall Size 8 7/8 x 8 7/8 inches, Cut Out Size 6 5/8 x 6 5/8 inches, Maximum Shoulder Width 6 3/8 inches Overall Size 8 7/8 x 8 7/8 inches, Cut Out Size 6 5/8 x 6 5/8 inches, Maximum Shoulder Width 6 3/8 inches