The size depends on the application.
Making hole in concrete wall.
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.
These holes will mark the boundaries of the opening and help guide your cuts.
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.
Once you are done with the drilling it will remove the large center piece to leave you with a large hole.
You will find most core drill bits coming in different sizes such as 2 inches or 4 inches.
5 line up the blade of a.
The hole should be slightly smaller than the maximum width of the.
A core drill is simply a drill bit used for making the large holes in concrete and masonry materials.
Unless you want to buy a hilti dd100 and the bits which will cost you way more than hundreds.
Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit.
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.
Sorry i just re read your post.
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.
Match the correct anchor size to that of the concrete screw.