This significantly extends the range of what the drill can do! I just drilled 3/4 way into a piece of 2 by 4 wood with a smaller diameter wood bit, then drilled the hammer bit into it for a really tight fit. Next screw on a flat piece of wood to fit the concrete you are vibrating. It can be wide or long or whatever. The drill has 3 settings, drill +hammer, hammer only and drill only. Set the drill to "hammer only" and start vibrating the concrete! It is that simple! I had a big project with really hard rocks to drill and break into pieces and they wore out a drill bit head on my Bosch hammer drill. I still wanted to use the bit for something. These are high performance tools so it should last a long time! You could also use it to vibrate castings to good effect. Another option is different attachments to go deep in the wet concrete.