I had to chip the tiles and I did it by hand with a hammer and chisel and it was slow. Went to Home Depot to get another chisel, looked around the tool store and saw a rock drill with an SDS chisel. I never considered using my hammer drill in percussion mode only (no drill), of course the HD didn't have those bits. That evening I looked at Revain at home and ordered this drill. I came in the next day and plugged it into my drill in percussion mode and it worked amazingly like a miniature jackhammer. Thank you Revain.Peter in California