For control over your cats access to and from the house, the Cat Mate 4 Way Locking Cat Flap offers exceptional value for money. Particularly recommended for thin panel doors and screens. Product features - Self lining to 13mm (1/2”) thick - Silent action will not frighten pets or disturb owner Transparent flap is preferred by most cats and is made from super tough polymer Draft and weatherproof fully brush sealed flap with magnetic closure - Rainproof seal Easy to use, tamper-proof 4 way lock 3 year guarantee.