You'll appreciate how easy this pet gate is to operate, just expand the gate in the opening and lock in place. The EZ track does all the work for you. The panels slide on this track expanding and contracting this gate with ease for the perfect fit. There's no assembly or tools needed. Use it in doorways, hallways and other spaces measuring 26 to 42 inches wide. Safety gate is certified by the Juvenile Products Manufacturers Association (JPMA) for use with children ages 6 - 24 months of age.