It will take A1 pictures in mounts as the extra rigidity from the mounts stops them flopping. As I had my paintings in cellophane slips I gave them a little extra support by inserting a sheet of hardboard at the back of the rack and one at the front to stop them flopping over. Once assembled, it does not fold as flat as when it is delivered but it is good solid manufacture.
This is perfect for exhibiting your reproductions or unframed works. Many cheaper varieties are not robust enough nor of the correct proportions for displaying anything other than cards. Thoroughly recommended.