Ratings & Reviews for Kobalt Diamond Core Drill Bit 1/4-in Dry, Wet Diamond Core Drill Bit for Stone

Junk

Tried to drill a hole in tile. The bit was burnt out before drilling 1/4 tile hole. $19 down the drain and I have 6 more holes to drill

Cuts a nice smooth hole

This cutter performs better when water is added, it will also cut dry. Will need to cut a hole with a drill bit in some scrap wood otherwise this bit will wonder all over and then clamp it to the tile piece for easier drilling

It will not work!!

It done nothing!! DO NOT BUY IT!!

structural failure

10 seconds into drilling and the bit collapsed/twisted

Kobalt tile bit

Does not last very long and is weak.

Failed little bit

The hollow bit got hot and twisted. First time I used it.

Worked...then broke

Needed a 1/4" bit to anchor a kitchen island to a tile floor. This bit was challenging to work with, took A LOT of time to actually drill through the tile and only worked for 6 holes until it just twisted in the drill. I've done this before in a shower but with a different bit and different size. Saw this bit at Lowe's and thought I'd give it shot. Quality just isn't there like the other brand of bit and certainly didn't last nearly as long as it should have.

Pretty good bit

I had 12- 1/4 holes to drill in porcelain tile. I drilled 6 completely with this bit and decided to just start the remaining 6 after it heated up some and twisted a little. No big deal.. I'll just swap out to the new Spyder for the last 6. Well, the Spyder only lasted 4 1/2 holes. So I ended up going back to the Kobalt to finish the job. Even though it was a little twisted. I made it work. All was drilled with water. Low to medium speed with some pressure using my corded Dewalt drill.

Not worth the $

Struggles to drill into porcelain tile. Could not finish one hole. A waste of money.

Poor Quality

The shank/shaft is so thin it bent soon after I started to use it without applying a lot of pressure. I put it in a bench vise to straighten it out to finish the one and only cut it was able to make. I m a contractor and was very disappointed and should have known better to buy a cheap Kobolt tool. I ended up buying a Starrett bit which was American made and much better quality and stronger to finish the job.

Drilling porcelain tile

This drill bit worked well, I had to drill 9 holes to install my shower door. It drilled perfectly, The key way to do it is start at a 45 degree angle so the drill bit won’t walk around.once it starts you slowly move it to a straight angle.keep the drill wet and clean it out after every hole and you should have no problems.

Didn’t last.

The bit couldn’t handle the heat and got completely bent/twisted after just a few holes even though I was using water to cool occasionally.

Use this bit for porcelain tile

Worked great, good price

No Issues at all! KNOW what your doing!

I have drilled 6 holes in porcelain with this bit so far and it looks the same as it did out of the package. The bad comments are from people who have no idea of the concept of drilling in concrete and tile...sorry not sorry! Put your battery screwgun on LOW speed and have a squirt bottle of water ready...the bit must remain COOL during drilling, and that's what the water is for. As soon as you break the surface of the tile by drilling on a slight angle, have someone squirt water on the bit th...

Worked great

I think the negative reviews are from people who didn’t know what they were doing because this worked perfectly on porcelain tile. Start at high speed at 45 degree angle and gradually move to straight on. Spray consistently with water while drilling and clean out the hollow bit too. Drilled 8 holes and could have continued drilling with no problem

Buy extra bits when drilling tile!

As I mentioned in my review of the larger size bit this design was able to accomplish (with a lot of time) what my carbide bit failed at (again not sure if I used it incorrectly or it was the wrong tool for the job). Partly I was very cautious as I didn't have the time to risk ruining my only other bit and have to run to the store and get more bits (and honestly they should be able to make more than 1 or 2 holes before wearing out). But ultimately this bit got the job done with enough patience...