Petsafe Staywell Classic Manual 4 Way Locking Classic Cat Flap White With Tunnel Overall size: 224 mm x 224 mm (8 7/8 x 8 7/8)Cut out size: 169 mm x 169 mm (6 5/8 x 6 5/8)Glass cut out: 210 mm (8 1/4) diameter circleMaximum pet shoulder width: 162 mm (6 3/8)Maximum pet weight: 7 kg (15 lbs)