This greenhouse is very difficult to assemble because most of the bolts do not go into holes, they go into sliding grooves and each time you finish one section and try to move on to the next, the bolts just slide out of the grooves and the frame falls apart. I finally used bungee cords to hold it together while I worked on it, but even so it keeps falling apart. This design is an engineering failure. The polycarbonate panels are very delicate. If you have a dog you will have to put a fence around this because it will not withstand even a small dog jumping on it or bumping into it.  By the way, I ordered this item which the website says is "Arlmont & Co. Immanuella" greenhouse. But what I received is a brand called "Outsunny" model number 845-058. It looks exactly the same as the one pictured here. I do not recommend this greenhouse.