15 Pcs Diamond Drill Bits for Ceramic, Diamond Hole Saw Drill Bit Set Kit, Premium Glass Drill Bit for Bottles,Pots, Marble, Granite Stone, Tile Cutting 0.23 Inch - 2 Inch（6mm - 50mm） YLYL

Cut through my granite countertop without issue. Use lots and lots of water to keep it cool, I had to snap the stub off about halfway through the cut. They're not the best quality but work as intended. Great value.

Exceptionally Surprised!!! Very Happy, Good Durability. BEST PRICE FOR EXCELLENT PRODUCT. Don't fear reviews claiming no lasting durability! This product is completely functional and durable as long as you keep the work and tool wet while cutting your holes.

they seem to work fine, except I was trying to make plugs of stone and the plug gets stuck inside and gets damaged when trying to get it out.

So happy I purchased these. I made homemade patio fountains and my husband was able to easily drill through the glass without issue.

Understand that these are all in metric sizes and this purchase was for the smaller sized bits. There are many sizes to choose from in this kit, from I think 3mm or 1/8 inch equivalent up to I think 24mm or like 7/8 inch. The sizes are laser etched on the shafts and are a little difficult to see, but the holes that they make are relatively smooth rather than just a sharp edge. The reason is that the bits are simply metal tubes that have one end dipped with metal covered crushed industrial diamond, much like sprinkles on an ice cream cone. With this said they are not lab quality sized bits, and have some cutting surface disparity due to the various sizes of chunks around the end, and this disparity will create a more rounded or smoother edge on the hole that you cut through the glass. Start out slow and at an angle with just the weight of the bit against the glass, and spin the bit against the glass until a little edge develops (I used a rechargeable drill), then add a few drops of water and start to reduce the angle and the edge starts forming a circle on the glass. Slow and steady wins the race!! This is glass, and super tiny pieces of glass are now being broken off of what ever you are drilling through so wear a mask, and have a removable work space that you can just wipe and clump up into a ball and throw away, like some damp newspaper that the wet paper will keep the super tiny glass fragments/shards from blowing away and you can just crumple up and throw away the mess with minimum wiping. With this set I managed to drill a 1/2 inch hole in the side of an aquarium for a water overflow, on one of those 2 1/2 gallon rectangle super thin glass aquariums with the black plastic frame, that still had some fish in it (do not recommend this). The hole was a success, the fitting has been installed and still the aquarium has fish in it (that suspect nothing.) Slow and Steady, listen to the screeching of the bit against the glass, if too much screeching you are either too fast or pushing too much. Slow down, add a few drops of water, and then continue on until you start to see the point where the water starts running down the glass on the other side, then slowly continue on until you have a hole drilled through whatever it was you were drilling. Note: I do not know what it would do to tempered glass, from what I know this would probably shatter any tempered glass the instant the bit scratched the surface. My use with these bits has been just plate glass and bottles. Good luck.

I got the package fine. I have used it to drill holes in 2 ceramic pots so far. Seemed to work well.

Exactly what I was looking for at a great price

I never thought drilling through ceramic and granite could be this smooth until I tried the YLYL Diamond Drill Bit Set. These bits cut clean and precise, making tough materials like marble, tile, and glass feel surprisingly easy to work with.The range from 4mm to 30mm covered every project I had—from small bottle holes to big granite cuts. Plus, they stayed sharp and didn’t overheat, which was a game-changer for me.If you want drill bits that turn tough jobs into satisfying wins, these diamond cutters are the way to go. They made my DIY projects shine bright! 🔨✨