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Mark
Reviewed in the United States on December 4, 2020
I bought two of these diamond core drill bits to drill approximately 6 holes through granite countertops.They worked great.For the technique - I got some playdough and make a "snake" that I put on the counter and formed a circle that was pressed around the area I wanted to drillI filled that area with a small amount of fresh water and then started at a slight angle to get the bit "started" into forming a groove in the counter top.Once the groove is started, you can move the drill to a more conventional "top-down" position which levels the drill bit into the counter.The water helps to reduce airborne dust to almost nothing and helps to cool the tip of the drill bit (important).Slow to medium drill speed is also important as is stopping every few minutes to add some more fresh water - the mix of water and the dust from the drilling creates a friction component for the bit which helps the drilling process.However, be sure to clean out the ports on the tip of the bit every few minutes as they can get clogged with the water/dust sludge caused by the drill bit being in the water bath.Solid product and recommended based on my experience with it.
Latitude 48
Reviewed in the United States on January 12, 2019
Based on the reviews I purchased this bit and I'm glad I did. I only needed to drill one 1/2" hole in my desktop to mount the articulating arm for my monitor. It did the job cleanly and easily. Since I was only drilling one hole we did not use water, and it appears the tool got quite hot... but it did a fine job and took less than 10 minutes using a 28V cordless grinder. If you plan to drill more than one hole I would recommend using water to keep the bit cool. I was a bit apprehensive about drilling into this hard 1-1/4" material but this tool made the task easy.
Mike
Reviewed in the United States on September 21, 2018
Needed to be used for refractory cement hole in the top and base. It took a little bit of effort to get the hole started, but that was due to how strong the refractory cement is. Once started, it chewed through it like a regular hole saw on wood.I used water to offset and increase the cutting potential and it seemed to help greatly. Otherwise it had a bit more trouble getting through the refractory cement.Getting through a side of a steel pale I had to use the side to cut a U shape to get the hole started, but after enough patience and effort it created a hole. It is ideal to be working with this on a flat surface with a corded drill/drill press (if you can) to insure the drill bit doesn't move.Used it to cut over 7 holes and round out the massive hole for the foundry on the top.
Amanda
Reviewed in the United States on August 26, 2018
I have some ceramic tile that just could NOT be cut thru! I purchase concrete bits and used a hammer drill, took literally 15 mins for us to get one hole drilled for the shower door. We started the 2nd of 6 holes and said nah, let’s go another route. I purchased a similar bit to this one but it was by Dewalt. Ran it for 15 seconds with a regular drill and it was shot!! So I found this DAMCO bit and purchased it along with the adapter. I used a cup of cool water and a regular power drill. Took about two mins per hole. The key was to not use a high speed or a lot of weight behind the drill. Let the bit do the work. Remove every 10 seconds or so to allow the bit to be dipped for cooling. Still “time consuming” to some, but if you have ceramic tile that’s oddly impossible, this WILL do the job!!!
Dixie's Dad
Reviewed in the United States on June 12, 2015
Not the highest quality core bit for granite, but certainly decent for the price. Works well if, and only if, you are experienced in coring stone materials and have the proper grinder/drill. Great delivery, and totally as shown on site.
Jeanne
Reviewed in the United States on September 3, 2014
The bit is sturdy enough, but the shaft that you buy extra on this website bent on the fourth cut into tile!! Because this was special ordered here, I wasn't able to run out and replace it on the job (which had me cutting 52 holes in tile and the same number in marble for a custom inlay contract). Instead, I had to go to Home Depot where I bought what felt like a very light weight Milwaukee bit and shaft... What I found was this setup from Home Depot was better than this hefty DAMO cutter. The Milwaukee bit had more water channels cut into it - giving it less teeth but a much cooler cut, and also a finer edge so the cuts were diamond sharp. As compared to this rather cumbersome thick edge on the DAMO. The four small water channels on the DAMO quickly got filled up with tile crud too.... In other words, save yourself some bucks and heart ache maybe too. Get the Home Depot or Ace Hardware or such Milwaukee cutter, and if anything goes wrong on the job, it's just a trip to the store...
Pedro
Reviewed in the United States on January 2, 2014
This worked like a charm. I did 3 holes in 3/4 inch granite counter top with a friend keeping the area wet with an atomizer of water.I also put masking tape over the area to be drilled and marked the circle (using same 1 3/8 drill bit) with a pencil.This is what YOU NEED TO KNOW: START drilling the hole with the bit at about a 45 degree angle. The bit will cut right into the granite without skating. (The masking tape may help also). Slowly bring the drill bit to straight up and down position as you continue drilling. I did the three holes this way with no problem. You can go to YouTube also and see how it's done, "drilling holes in granite".I used a fairly strong electric drill motor (had to buy the adapter). Took about 2 minutes per hole. I used pressure but not a lot, I let the drill do most of the work. If you use a grinder instead it may go a little faster.PS I made these holes in my office counter top so I could more easily run all the cables (computer, printer, telephone etc.) If you are doing a similar "office" job you should check out the Amico Computer desk 1.3" flip top grommets (Amazon) that fit perfectly into the 1 3/8 inch holes and make for a totally professional finished look.
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