For fixing a 2 inch screw on concrete wall, how should I drill for good strength and no damage to the wall. I tried a 2 inch screw and drilled for 1 1/2 inch and later tried to screw it into the hole. But the problem I faced is that after the end of the screwing step, a circular portion came out of the wall wall and it became a very big hole.
Now how to fix this?