Don't buy another piece of equipment you're going to use just once. The impact drill you've got is enough. It may be slow and difficult. But how many holes are you drilling anyway?
If you use a cheap RM50 drill and RM2 concrete bit, it's going to get some time to get through. But eventually you will get through. What tsunade says is true. You should feel the vibrations. It might take a while to get through.
Assuming your drill bit is long enough. Depends on the thickness of your walls. Some walls are thicker than others and the bit might not be long enough.
Oh, if you've got red clay bricks in them walls, these can be quite difficult to get through. The cement part on top of it would be relatively easy to ge through compare to those bricks.
Another thing is to not overheat the drill bit head too much. If they get too hot, they seem to get dull very fast. That seemed true when drilling through metal, so I just continued using the same method when drilling through walls. When it gets hot, dip the front end of the drill bit in a pail of water. I do not know if that is good or bad. But it does cool it down quickly.
This post has been edited by dkk: Nov 30 2013, 12:22 PM