I installed three of these, in line, on “railroad tie” type steps in my yard. Normally it would be easy to install these but the wood steps weren’t level and that would magnify the error up the railing pole. I had to use a belt sander and chisel to level the wood where I mounted the railing. Perhaps the provided expansion bolts work well in concrete but not in wood. I purchased lag screws to mount the railing. I’m happy with the end result and the railings serve their purpose.