3/4" Wet Drill Core Bits for Concrete and Hard Masonry, Diamond Hole Saw, 14" Drilling Depth, 5/8"-11 Arbor, Wet Only

I needed to drill a hole through a 8" thick 45 year old concrete wall to run the lines for my new heat pump. I picked up this bit, a 1-1/4"-7 Male to 5/8"-11 Female adapter, and a Makita 9566CV variable speed angle grinder. I created a plywood jib to hold the bit in place had an assistant run the garden hose while I set it against the wall and turned it loose.Eight inches of concrete stretched my little angle grinders abilities. As the grinder motor heated up we took a couple "lets go work on something else" breaks. As the bit gets deeper into the wall, it gets harder to keep the bit perfectly aligned and so extra "drag" starts making the amount of work to be done much higher. When I figured that out, I busted out the core slug which made a large difference, and was able to finish up the drill without any further overheating of the grinder.

The product worked great and was the best value for the dollar. Used to core 6 inch wide holes in 6 inch deep patio. Used a 7 amp drill and but could only run 5 minutes at a time due to over heating. are used this adapter to fit it on my corded drill ( HEX500-2 Core Bit Adapter with 1-1/4"-7 Thread to 1/2" Shank https://www.amazon.com/dp/B01N7UABOF/ref=cm_sw_r_cp_api_i_SKkbFbSH4BGNX ). Had water running on it the whole time. Cut rebar no problem.

I used this core drill to make the holes necessary to install a radon mitigation system in my house. I used this 5” core drill to make a hole large enough to install 4” schedule 40 PVC pipe, which has a 4 1/2” OD. I drilled through a 4” basement slab and a 6” concrete side wall and the drill still looks to be in great shape. I used a heavy duty Milwaukee hammer drill to drive this, but I did not use the hammer feature. My wife sprayed water into the drilling area using a pump up lawn sprayer during the drilling process. It seemed like a pretty slow speed gave the best results. This took a while to drill through and I had to cool off the drill motor a number of times during the job. This was money well spent.

Worked great with my little Bosch Bulldog hammerdrill with the "hammer" function turned-off (with an SDSPlus adapter I also bought on Amazon). I didn't have a pilot bit, but used an old trick for drilling holes in tile - tipped the drill bit 15-20 degrees off vertical and slow bit speed. I made a V with my feet with the bit resting at the vertex of the V, and used just the edge of the bit to start the hole. My daughter kept the bit lubricated with a 1 qt. spray bottle of water used to spray the hole/bit interface, and the bit made a perfect hole through the slab in our basement. The bit was great, but the Bosch started smelling like it was overheating before I finished - make sure your drill is heavy-duty, or let it cool down before continuing if it starts smelling or feeling hot.

The media could not be loaded.  I bought this bit based solely on fastest delivery, i had no problem spending twice as much for a different one that seemed to be of better quality but I was able to get this one the very next day instead of a week. I hooked it up to my hilti core drill using an adapter that cost just as much as the bit itself and still managed to spend only half the price compared to buying an actual hilti bit.I’ve drilled 10 holes on 4 inch Concreete so far so i can’t comment on durability but i didn’t notice any difference on speed between the first hole and the last.

I'm planning on using some of the native limestone on my property to make a water feature that looks like a natural spring. I used this bit to bore through one that was about 8" thick and then chisel around it for practice before I work on the one I will install permanently. Driven with a Bosch SDS Plus hammer drill through a 5/8-11 arbor, I had no trouble going through it in 10-15 minutes. I did take it slow and kept a hose on it the whole time. You can see in the picture that the bit made a nice round hole, though it left a little of its red paint on the sides, easily removed. I did not see the very helpful idea of using bored-out wood as a guide, but I will probably try that. Also though, since the sides of the bit are smooth and wet, and since the bit has no "teeth" as such, you can simply use your hand to guide it. The 1½" bit I bought turned out to be a little oversized for 1" PVC, so I'm buying another one that's 1-3/8 for the final cut.

I Needed to drill through 8 inches of a granite stone for a 1 inch pipe. I kept cold water on during the drilling and the bit stayed nice and cool. It took some time ( about 40-45 minutes ) I bought an adapter to use with my drill but the threads were not long enough for the bit ( the Threads don't start at the top so 1 star deduction for that ). Luckily I also have a cordless Milwaukee grinder that fit perfectly. The grinder worked great and I was able to put a lot of pressure on it too without any overheating. I went through 4 batteries ( 5ah each ). I could have used a hammer drill and star bit for MUCH faster results but it would have blown out the rock on the other side. As other have said , you need to start the hole at about a 45 degree angle and then straighten up. The bit has plenty of life left too! Great drill bit.

I've drilled three 3" holes in 8" concrete walls and the bit continues to perform well. I'm using a hand held drill with a 1/2" chuck to hold the 1-1/4"-7 to 1/2" adapter. Starting the core is tricky and keeping it perpendicular to the surface is tricky. Having a second set of hands makes the start and drilling go much easier. The secret is to use enough water (to wash the cut concrete out of the core), be patient (like any diamond drill) and, as others have said, let the bit do the work. Great value, since having a concrete cutting company come out and drill these 3 holes would have cost me over $600!

The matrix is not as it is pictured. The cost to ship it. I ordered a 2-1/2" and automatically got billed for a 3". the price is good for what it is but the shipping undoes that. Hopefully it doesn't fall apart. Not happy with the shipping cost overall.

Works great. Shipping was way too much.