4 Inch Diamond Drill Bits Glass Hole Saw Drill Bit Set for Glass Ceramics Porcelain Ceramic Tile Marble

Bought these to put 1/4 inch holes in quartzite to hang a range hood.I had attempted to use a natural stone bit - which did not work. I then tried these, and they worked great.One bit would successfully make on hole in 3/4 inch quartzite. The bit would be useless after that - it would either snap in half or be fully dull. I used 8 bits to make 8 holes.One word of caution is starting the process with these types of bits - you need to hold the drill at about 45 degree angle to get the bit cutting into the stone, then slowly level it out. Its a bit tricky if you are trying to line up markings - however, if you don't apply much pressure starting out, and let the bit grab, it works great!Definately would recommend and buy again.

Bought the 2-in hole saw to cut through 1/4-in glass. I was working vertically, so didn't have gravity on my side; took me probably 7 minutes to cut through the glass with limited chipping at the end. Great value!

I used mine to drill a hole in 1/4" thick borosilicate tube and it worked fantastic. Do this underwater. Do be careful with the water from this, since it can really hurt someone if it goes in the wrong place.If drilling a hole in a glass item 5" wide, you might find a 5" wide plastic container, and put the container in a vice with the item compressed inside the container to keep it from moving during drilling.

I'm a remodeler, and purchased this hole saw to cut a hole in tile for a shower valve. Being so large, I wondered how I could get it to accurately cut a hole in my tile without it wandering and scuffing up the surface. I did three steps which made my hole cutout perfect. First I cut a hole in a piece of backerboard using the hole saw. This piece was to be my cutting guide. Then, I cut a piece of sponge and put it inside the bit so that it would release water and cool the bit as I drilled my hole in the tile. I positioned the backerboard on the tile and clamped it there. Then I soaked the hole saw and sponge in water and proceeded to cut the hole in the tile. The sponge and water kept the bit cool and the backerboard template kept the hole saw from wandering. It was a perfect cut! This bit is by far the most economic way to cut a clean hole. The bit is already much duller that when new, but it will work great for several cuts, but not many more than that. Keeping the bit wet and cook is essential- otherwise your bit might not last more than one or two holes. There are many others costing 10x more and made for daily use, but my use was one or two times only, and for that, this bit was perfect.

These cut through porcelain plates like butter! We needed to drill holes into 27 plates to make several tiered dessert stands for our wedding. We were using another brand’s drills and it was taking FOREVER. Like 20-30 mins per plate. I ordered these because we planned on recruiting some friends to help. When these drill bits arrived we decided to try them out and we were blown away!! It took just minutes to drill a hole in the plate. We ended up not even needing help and finished the rest of the plates within an hour. Highly recommend!!

The media could not be loaded. Delivery was great, fast on time as advertised. However the bit it self was horrible, as we all know these bits are quite expensive at $17-$23 per bit (Milwaukee), I decided to try these as I am working on a big project and need to drill 30 holes min into each restroom, the tile I need to drill through is a lot harder than the small bathroom tile in the video Review I’ve linked here. Let’s just say this bit could NOT finish the job in this soft tile. Don’t waste your money.

No experience drilling ceramics so seem to work okay. Took long time to drill (12) .125 holes in terracotta piece. Kept dipping in water and took 2 bits.

It's shallow.