The size depends on the application.
Making hole in concrete wall.
Unless you want to buy a hilti dd100 and the bits which will cost you way more than hundreds.
A core drill is simply a drill bit used for making the large holes in concrete and masonry materials.
Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit.
Expand the drill hole to accommodate the anchor.
Sorry i just re read your post.
After hearing that i seriously considered just gluing a piece of plywood over it and calling it a day.
Easiest way is to call diamond drilling or a similar company and have them come out and drill all your holes for a few hundred dollars.
Menards and other places rent core drills for large holes in concrete.
You will find most core drill bits coming in different sizes such as 2 inches or 4 inches.
I ve hammer drilled through concrete to sink anchors but a 4 inch diameter hole is a little intimidating until you have the right tool.
The hole should be slightly smaller than the maximum width of the.
The guys at home depot had a lot of fun lamenting the fact that the hole existed to begin with and then suggested that i build a mold on one side of the wall and fill it in with a pour of concrete.
Here s a few pictures of the right tool.
Remove any concrete dust then press the anchor into the hole until it is flush with the surface.
If necessary tap.
5 line up the blade of a.
Once you are done with the drilling it will remove the large center piece to leave you with a large hole.