It's not possible to put the wheels on this as the holes in the bottom are too small for the screws that come with it. I bought it because it had wheels so this is very disappointing​. It's far too large and heavy for me to be able to return it so I feel screwed now. Not sure why this is still being sold when it has such an obvious design flaw. I don't have any tool that can make a larger hole in metal Sonic can't fix it either.