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

Excellent quality

I used another brand of this same drill bit and this drill bit was far superior as it did not become dull after drilling the same amount of holes through tile.

mnichols

Only cut 2 holes and it was shot. I definitely wouldn’t recommend this product. I’ve tried HD and Habor Freight bits and honestly they must all be made by the same company. Not recommended.

Use water when drilling

Works well as long as you use water with the product

Fantastic for Porcelain Tile!

I use this bit all the time for shower glass installs. Drills perfect size holes to set the anchors in the tile. No Chips when drilling

Don’t bother with this tool

Junk. Bought this to drill holes in porcelain tile. Less than halfway thru the first hole the bit had bent enough to make it useless. Took a long time to drill as well. Got a Lenox diamond bit and it went thru the next 3 holes like it was wood. Get the brand name!

Worked !

Had to drill holes in tile to install towel rods , towel hook and medicine cabinets 10 holes in all. It did a good job it took some time you have to take your time and don’t rush it. I found out it cuts better if you keep spraying water on and in the hohe so as to not heat up the saw to much. I think it has a few more holes left in it’s life so for the fair price it’s well worth it. Also make sure you clean out the hole in the saw (bit) and it will go a little easy.

Highly recommend for glass tile

Works as advertised! Used this drill bit to install a glass panel into our walk-in shower. We have glass tile and it worked with relative ease drilling 4 holes. I suggest watching some YouTube vids to familiarize yourself with the process as it takes a lot of patience when drilling through glass without cracking it.

Super clean cut

Super clean cut… I was worried about a chip and having to replace the tile, but this cut in perfectly so I could place an anchor. I used this for a shower rod and worked perfectly

Performed as expected

I needed a small hole saw to bore through newly installed tile for a toilet paper holder. I first marked the location of the two holes. I wanted to use it wet, so I had my wife hold a wet sponge above each location and slowly squeeze as I drilled. I quickly learned that it's near impossible to hold a hand held drill on the target spot with the end of the bit flat against the tile. You have to start it at an angle to get your first bite, then gradually straighten the bit as it cuts. It performed ...

Good Hole Drill

Found it works well. Got this to work with roofing slate. The only issue is starting it with a hand drill is that it tends to walk. But once you master that it works very well

Difficult bit

Tried the quick change ¼” shank but preferred to insert directly into drill chuck. Bit seemed to work much better wet than dry. Slotted for material extraction, but center of bit fills up, particularly if wet. For a ¼” hole, this bit was very hard to start and skated easily on tile. Packaging says to operate at maximum speed of 400 rpm, but needs to operate much faster to drill in a reasonable time. Appears to be durable with no signs of wear after one hole. Not the best option for this small ...

Cuts well

This one was a little bit of a challenge. Being only 1/4”, it’s not as easy to start it. It wants to travel on you. If you’re able to hold it still enough for the edge to start, you will be fine. Like the others, the edges were clear of chipping, and smooth.

cheaply made

Twisted like a bread tie with even a mild ankint of force applied.