Swing Cat/Small Dog 4 Way Control Door can install a flap dedicated exclusively to your four-legged friend on any wooden, metal, glass door and on brick walls. The 1 door is equipped with a 4-way closing system that allows you to adjust the opening of the door according to your needs: entry and exit or closed. It is supplied complete with a partial tunnel; for installations on very thick doors or walls. Offers your pets the freedom and independence to come and go. Door is designed with safety and security in mind, featuring a built-in lock easily operated by adults and older children.