JOHOUSE Diamond Drill Bit Set, 18PCS Hole Saw Set for Granite Stone, Glass, Porcelain, Marble

A professional might be better served with something higher quality but this assortment has served me well with several projects around the house including drain holes in plant pots and mounting holes in tile and quartz countertop.Good assortment of sizes and handy to have around as a diyer.

these are great for the price but not very durable

I used the one inch bit to drill holes on the bottom of a thick glazed pot. It worked fine. You must keep water flowing while you drill, and start the hole on a 45 degree angle till it bites in, then ease it over straight down and move it a little back and forth while drilling. These are way cheaper than ones I saw in the home stores.

Sorry by mistake I order twice I going send back

This is a good set for light duty work or if you plan on using it for only a few times. I purchased this for only one bit because it was still cheaper than purchasing the individual bit locally. It did do the job just fine and I still have all of the bits.

A while back my wife and I did a pottery class. One of the pieces in particular was somewhat small and a little wonky, but had so much character I wanted to make it into a pot for a peperomia. After looking at a few options, I decided to give this set a try. It was the cheapest option and I honestly worried it might not hold up to even one use.I was surprised that it did the job well and quickly. The outer glaze was vary hard and the bottom of the cup turned pot was about an inch thick! However, once the initial cut was made, the bit did a great job going through the entire base. When I was done there was plenty of grit left on the bit to do another pot or even a few more if needed.Plus this came with quite a few sized bits, so I'd be able to do several more pots even if each bit only lasted 2-3 pots.If you are looking to just do a couple small holes in ceramic for a hobby, I'd definitely recommend this set. If you are doing this professionally as a tile layer or something, this will work, but might wear out faster than other sets. It also only has a solid cutting surface, no reliefs, and for my handheld approach it worked, but the final hole was somewhat irregular. That is no problem at all for my use case, but something to think about.Honestly though, I was shocked at how well it worked and held up for the price.

I had to drill multiple holes through tiles to mount a floating vanity. Picked up the "real" bits from Bosch and Home Depot ($10 ea, multiple sizes) and ordered these as a backup.Spoiler, the "real" tile bits sucked. Took forever to drill a single hole. I finally tried these cheap ones and it just sailed right through the tile. I literally could have saved 2 days and 2 trips to Home Depot if I had just started with them.Not sure on longevity, but so far I have 4 good holes through a 1/2 tile and we'll see if it can do 4 more. For $11, I picked up another set just to have on hand.No guides needed. Just start with the drill on slow and start at an angle. It should be easy to keep the bit from walking. Once it cuts a crescent semi-circle, tilt up and plunge straight into the tile.I also added water every 20 seconds or so using a spray bottle. (sprayed the bit and sprayed the wall.) That cleared out some grit and cooled the bit down.

For the price, it's worth it. You can most likely core 1 maybe 2 holes with these, while keeping them cool and no pressure on the bit. The cutting edge on one fell apart before the first hole was made. If you have the extra cash, get a better quality set.