Once you are done with the drilling it will remove the large center piece to leave you with a large hole.
													
																	Making hole in concrete wall. 
									
	
		
	
																	Menards and other places rent core drills for large holes in concrete. 
																	After hearing that i seriously considered just gluing a piece of plywood over it and calling it a day. 
																	Here s a few pictures of the right tool. 
																	The walls at our new place are 6 inch thick concrete it s an old naval base and we needed a few holes for vents. 
															
													
									
	
		
	
																	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. 
																	The hole should be slightly smaller than the maximum width of the. 
																	5 line up the blade of a. 
																	If necessary tap. 
															
													
									
	
		
	
																	The size depends on the application. 
																	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. 
																	Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit. 
																	Sorry i just re read your post. 
															
													
									
	
		
	
																	These holes will mark the boundaries of the opening and help guide your cuts. 
																	A core drill is simply a drill bit used for making the large holes in concrete and masonry materials. 
																	You will find most core drill bits coming in different sizes such as 2 inches or 4 inches. 
																	Expand the drill hole to accommodate the anchor. 
															
													
									
	
		
	
																	Remove any concrete dust then press the anchor into the hole until it is flush with the surface.