Have you ever needed to move a table and you're all by yourself.  No one else around to help?  It's hard dragging tables across the floor.  Wouldn't it be nice if the table bases had locking wheels on them so that when you needed them to stay put......they would, and when you needed to move them.....you could?  Well worry not.  We've heard your cries for help and now you can do just that.  Many table bases can be ordered with casters.