They didn't measure 1" inside the U-bracket, but I managed to use them in a laminated table. Unfortunately I had to buy two sets, one with a lock and one without a lock, to get it right. I tightened the screw through a pre-drilled bracket to hold it in place. I recommend drilling a larger hole than the screw will rest on the underside of the U-bolt to give you some adjustment range for your table. If you try to drill two precise holes you may find that there is a gap at the bottom part inside the shackle that you need to remove and open the handle a little deeper. The roller works very well on vinyl floors and works well enough on carpet , as long as the object to be carried is not too heavy.
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