Flip cells  
This interesting tool permits the interchanging of values of a selected range.
In other words, the value of the first cell is positioned as the last value of the selected range; and the value of the last cell will now be in the first cell. The second value will become the penultimate value, and the penultimate value will be come second ... and so on ...
See the example below:
We wish to interchange the values of the selected range.
After applying this tool, the results will be as follows:
To reverse the changes, simply apply the tool again.