"The 400 Cat Flap from Staywell is a 4 way locking magnetic flap suitable for cats up to 15lbs. Finished in white the 400 is suitable for fitting in windows walls and doors to a maximum depth of 54mm. The 4 way locking action allows you to set the flap to In Only Out Only Open or Locked while the magnetic operating collar key will further ensure stray cats are kept out. The Staywell 400 comes complete with magnetic key and collar. Overall size: 252 mm x 241 mm. Cut out size: 175 mm x 168 mm, Glass cut out: 212 mm diameter circle. Maximum pet shoulder width: 150 mm, Maximum pet weight: 7 kg (15 lbs)."