The cat flap comes with 4 locking options: in only, out only, opened and locked. Comes with a tunnel for use with wider doors for example solid wood doors.
Measurements:
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 circle
Maximum pet shoulder width: 162 mm (6 3/8")
Maximum pet weight: 7 kg
