I was able to core two holes through a 10” stem wall. On the third hole the two of the cutting teeth broke off. It did a fairly good job while it lasted. It is obviously not a high quality steel based on the price, but it will do simple jobs.

Have used to 'core' three different types of material, marble, onyx, and snowflake obsidian. Most important detail is that keeping a perpendicular drive pressure to reduce drag on the inside of the bit is very desirable.Additional comment, the denisity of the diamond grit is quite good! Product wear is very satisfactory!

Used this to drill 2 holes about 5" deep in stone face of hose for tankless water heater vents. Used lots of water and need good drill. Makita right angle. Worked as it should have. These were for 2-in PVC pipes. If I did it again I would have gone to the two and three quarters inch hole size.

I have bought many very expensive bits costing well over 100.00. These perform as well or better than any of them. May not be suitable for use on historic or fragile buildings or structures.

Cut hardened concrete for drain line between floors of residential home. Thankfully cut thru the rebar as well. What I ordered!

Site conditions required coring 4" deep, with 2-1/2" diameter bit. Material was granite capped off with blue stone.Once I switched to this bit, the speed of coring and quality went from 15 minutes per hole down to 2 minutes. This is the best value for the money, excellent quality, and superb performance I've purchased.

This worked perfect to cut holes in my pool to add in umbrella sleeves. I used a polisher to dial in the right speed for cutting. Just kept a hose trickle of water around the edge and it cut quick. Great!

Tried 3 other bits to complete the desired bore hole through a granite river rock, this bit took care of the job quickly and easily.

Drill bit worked nicely for the job it was needed on, two holes through 4” pre cast concrete, it was purchased to complete the one job and now any holes from here on out are free.

I bored out a 1" hole about 2.5" thick in a concrete floor. It took about 10 minutes with dewalt 60 volt drill. I could have easily done this with a smaller drill. I kept lightly spraying the whole with a water hose. I'm very pleased with it.

Cored 42 holes 7 inches deep into a rock wall to anchor a vinyl fence on top of the rock wall, No problem the more water I used the faster it cut through the rock and mortar

Worked great! Was able to drill through a 10" concrete block filled with concrete in about 20min. Need to keep the core bit flushed with plenty of water to keep it cool and clear of slurry. Drilled a nice neat round hole to feed 1" electrical conduit through to complete the job.

my $150 Milwaukee bit dimond limbed tip broke off. I was my fault. I forgot to take my hammer drill off hammer. vibration weakened joint. I bought this cheep bit and it worked great.

This was a 1/4 of the price as a local supplier so I figured I would take a chance and so far worth the money That's my feedback.

Great well made diamond core bit! I drilled through two 14 inch granite boulders for a fountain and drilled right through them. Just tricked water with a garden hose and i drilled precise holes with ease. Even after drilling through granite, the diamond core drill bit has has a lot of life left. I strongly recommend it and recommend buying the adaptor suitable for your drill. Best part is the bit was just as much as renting it from a big box store!