Is there a way to rescale an object?

I created a prop, and when I first made it I created too big.

I know I could start over, but I am curious if this group of props can be rescaled to where the size I have it now, thus becomes 1.0 Scale?

I created this at first as a huge scene, then I realized this would make a good railed walkway for a sci-fi vid or even a warehouse possibly.
The “problem” is currently the scale is .04. I placed a 1M box next to it to show the scale.

Thanks if I can reset a scale of a prop or group.