Standing desk (converts other desk) (Hollingdean)

As in picture. It goes on top of a normal non standing desk. I picked it up outside someone else's house thinking it would be great as I had a standing desk in the office I worked in at the time and loved it. Reality is my home desk is a disaster area and I never had the resolve to clear it to make space for this, so I never actually used it. It's 50cm tall, and 50dx60w cm on the bottom.