for cats plastic transparent flap, silent action with special sealing and magnetic lock with safety lock depth 13 mm total measurements 27    27 cm cut out size    26 cm flap size 14.7    15.8 cm 3 years guarantee  Tip: We recommend that you ask a glazier to cut a hole in the position required. It is also possible to replace the glass with plexiglass and cut the plexiglass yourself.