JINGLING 19mm 3/4" Diamond Tile Hole Saw Drill Bits Masonry Tools for Stone Pack of 5Pcs

I'm drilling through 1 1/4" hard granite. I tried a similar Milwaukee bit from the orange big box store, which cost $16 and these bits did every bit as good, or better, that the more expensive bit. I didn't expect this since I was getting 10 for the price of 1, but it's really true. A single bit has easily gone through two holes and I'm pretty sure I can get a third on the same bit. As others have said, take it VERY slowly and be patient. I'm using a 3/8" corded drill with probably about 200-300 RPM and generally light pressure. Takes about 10 minutes to get through one hole.

Definitely recommend these bits. Worked flawlessly on hard porcelain (PEI 5) only used 1 bit to drill 4 holes on wall tile. Drilled slowly while constantly spraying water on the bit with a spray bottle. I expected much worse performance for the price of these 10 bits but I didn't even have to use more than 1 bit.

Did a good job cutting through mullite ceramic plates. 16 holes with one bit. Made sure there was good water flow to cool bit and clear cut material out of the hole. Bit still seems to be in perfect condition

These are nearly worthless. Had I wasted my time I would've burned thru all 5 just to get one 1.5" hole drilled thru tile into concrete. Cheap.

Worked well in a drill press and cut glass quickly.

Muy bueno

We got 1 1/2 holes per bit, through 5/16” thick hard porcelain tile. each hole took 5-10 minutes, drilling up. Instructions to start bit at 45 w drill spinning, brace your hands well, worked very well.

They cut great as long as you go slow.

I bought these and another brand of hole saw bit, and I can only say I was impressed with the other ones. The ones-that-aren't-these-ones cut three holes in 1cm thick glass and still had a bit of life in them. I burned through two of these bits cutting one similar hole, even with diligently keeping the water up to them as I was cutting. These will do the job and won't break the bank, but they aren't as good as some other budget bits on the market.

so far they have done a good job of drilling holes in the bottom of liquor bottles for a project I'm working on.