Yeah, small casters that do lock but I want to be able to swing it of of the way and the way I had it set up previously was a pain. It looks like it might be flimsy as there is no lower support but the design was made so I can park it over other items to get it out the way. The 2x6 construction is reinforced underneath by several 2x4 cross braces preventing lateral sway when you roll the box out of the way. Glued and screwed all of the joints to boot.