Namsan Magnetic Automatic Lock/Lockable Puppy Door Pet Screen Door Dog Gate Way Pet Door for Screens - Medium 10" x 8" Thickness 0.55",Puppy door --Large: 8W x 10H" (Inner); opening,Installs easily,For screen doors and windows Two ways of solving the problem of falling apart:1.more studs have been added for the screen; 2. four cable ties that can be repeatedly used have been provided for every package. (April, 2016) More Fastness, Auto-Locked,'Gen-2' is a magnetic door, can Auto-close well Durable, self-closing pet screen door,Not included the Screen Namsan's order just need usually 6--14 days arrived your home(Not as Amazon system shows:14--28 working days),Recommend FBA for You : 1--3 Days Delivery, Easy return, 30 Days Guarantee, Friendly Services Available in S,L Durable self-closing pet screen door For cats, small dogs, medium sized dogs and medium/large dogs. Install easily