for dogs (size M   XL) plastic flexible transparent flap, silent action sturdy metal bar at lower end of flap lockable with removable metal rear panel which protects against intruders and against wind and bad weather incl. tunnel element depth 19   32 mm can be extended with tunnel elements total measurements 39    45 cm cut out size 33    40 cm flap size 30.8    38 cm 3 years guarantee