Color: Brown Size: L Sizes: S: 20*19.2*1.5cm M: 20*19.2*5.5cm L: 25*23.5*5.5cm Weight: S: 280g M: 367g L: 496g (Note: The S size is compatible with glass doors and thin doors, and cannot be installed on thick doors) This is a pet door that allows your cats and small dogs to come and go freely. Four types of settings are available: one-way (exit only/entry only), free passage, and prohibited passage. This type is installed by making a hole in the wall or door. The appropriate thickness of the door to be sandwiched is about 3cm, but it can be used if you prepare longer screws and sandwich it if it is thick.