Customer Reviews for VEVOR Diamond Core Drill, 4\"/101mm Diameter Core Drill Bit, 9.5\"/241mm Concrete Core Drill Bit, 5/8\"-11 Thread Core Bit, Dry/Wet Drill Core Bits with a Blade, Diamond Wet Coring Bit For Concrete Br

This is an awsome core drill, i was skeptical at first, because of some bad reviews i saw. But this thing went thru a foot of rock wall with no issues. Bit is still intact,all teeth are good. Would definitely recommend it.

I bought this bit to bore a 4 -1/2" hole in my 5in thick, steel reinforced concrete in my upper patio to drain the Dry Below system. I used a 12 A hammer drill in drill mode. I used a little water and the bit walked through the concrete and steel in about 10min using no pressure just the drill motors weight. This bit performed perfectly. Thanks for asking.

I am very pleased with this purchase and it does a wonderful job, great value and paid for itself in less than an hour!!!

Perfect for what I have to on my projectI love it, It really with it for the money I paid for it lo

Now, this is a Diamond head drill! Awesome!!

This bit worked really well once it gets started correctly and is kept wet with a constant stream of water, but that’s a given when drilling stone, block, brick, or other forms of masonry. I drilled though red brick and the concrete block just behind it in about 10 minutes. But the pilot bit is terrible. The way that the arbor at the top of the drill tube is machined causes the pilot bit to be very lopsided. I fixed this by two different methods. The first, I put some tough wire around the pilot bit at the edge of the tube (see the picture) and I centered the pilot bit by using three pieces of wire one attached to every other tooth on the tube, I tightened the wire with lineman pliers. That worked ok as the wire would break away once the drill tube started into the block but before the pilot bit would go off to one side. But then for another job I improved on my design and drilled a three inch hole with wood hole drill into a piece of one inch wood. I sanded down the edges a bit so it would fit the tube loosely. I then placed this cutout, with a little black tape wrapped around it to make it snug, into the very front of the tube (see the other picture). This worked extremely well, as the drill tube went into the block, the wood cutout traveled up the drill tube. But once I got about three quarters or an inch into the tube I removed the wood cutout and the pilot bit since neither were necessary any longer. The bit sailed through the brick and concrete block. Perhaps the manufacturer could make a design change and have an insert that would keep the pilot bit centered but also ride up the tube as you bore the hole. All in all, this a good product for the money. Just remember to have someone help you and keep spraying water right onto the front of the bit and into the hole you are drilling. No matter what, never drill masonry dry, your bits will last much longer if you keep them cool and wet.

Good price, quick delivery, product working fine. What more do you expect me to say??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

drilled through concrete block

We cut through block with this, went slow, and it cut through it no problem. Very good value if you’re only needing to make a cut or two. Definitely buy the shank that it suggests, no local retailer near me carrier 5/8” shank needed.

Although I only have an old hammer drill (Hammer off) I drilled it wet. I first hammer-drilled a small hole through the wall and then ran an evaporative cooler water supply line into the inside of the basement. I inserted it inside the small hole and stuffed some foam insulation around it so that water would come out into the center of the coring bit. I then mounted a piece of particle board with a 4-in hole in it to guide the bit. It worked really well! I am 70 years old and I was drilling the hole in a very awkward position but I'm quite happy with the way it turned out. I know that the bit teeth were wearing down, as they are supposed to, because I occasionally saw a sparkle of diamond dust in the water that came out. That coring bit is tough and it has several holes left in it!