Drill Guides for Transferring Wall Cut-Out

I was making an opening in an interior, non load bearing, wall and needed a way to transfer the opening size from one side to the other.  I used a 1/16" diameter x 6" long drill bit to transfer the corner locations of the opening using these drill guides.  The guides were clamped to the inner side of the first opening made and guided the drill through to the opposite face.  The hole locations were then used to layout the second opening.