Buying one of these online is impossible!
This tray is well-made, sturdy but also fairly lightweight. However, it did not fit my walker, despite my careful measuring. It tipped at the drop of a hat, and short of adding unsightly supports of some kind there was no way to secure it. I've come to the conclusion that one has to find a store where medical equipment is available and try trays on the actual walker in order to find the right one. It wasn't practical for me to send it back, given the reasonable price and the difficulty of getting to the post office, so I donated it to a thrift store. Caveat emptor, I think is the expression.
Rating: 3 stars