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

First of all, you're not getting professional quality Diamond hole saws for $8. That said, these work amazingly well! I cut out a small section of tile for my claw foot tub in about 30 seconds. Here's what you need to do to get nice round holes: 1. Have a small vessel of water to dip the saw into before you start and at intervals as you are drilling. Lay out (mark) your exact hole location with a full circle so you know exactly where to start. Start by tilting your drill at about a 5 degree angle and spin it FAST. Diamonds cut best at higher RPMs. Slow will work poorly and slowly... fast works much better because you aren't having to try to steady the drill as much. As you start cutting on your circle mark, slowly decrease the angle (square to the surface) so your drill begins making contact with the full circle as it cuts through. Once you've made full contact all the way around the circle, you can apply more pressure. Don't forget to cool the drill about every 15 seconds of drilling time by dipping it fully into the water. The water will fill the groove as you cut. It also acts as a lubricant to clear the dust and speeds cutting. Wetter is better! If you can dribble a steady flow as you drill, even better. I cut a 2in and also a 1in hole perfectly round with this set of hole saws. They work great. They arent prefect but they definitely do the job nicely. For the price, you can't beat these! I only needed a couple uses but these will cut many holes if used properly.

Good quality does the work fast and clean holds real good too

I bought this 15-piece diamond drill bit set for some tile and ceramic work around the house, and I can say they definitely do the job. The variety of sizes in the pack is excellent, covering almost any small to medium hole you might need for bathroom fixtures or kitchen backsplashes. They cut through ceramic and glass cleanly as long as you use enough water to keep them cool. In terms of durability, they don't last very long. You might only get a couple of good holes out of each bit before the diamond coating starts to wear off. However, considering the very low price for a 15-piece set, I knew exactly what I was getting. It’s much cheaper to buy this entire pack and use them as 'disposables' than to buy one single professional bit that costs five times as much. If you are a professional contractor doing this every day, you might want something higher-end. But for a DIYer or someone with a one-time project, these are perfect. They are effective, affordable, and get the task done without breaking the bank. Just remember to use low speed and plenty of water, and they will serve you well for the price!

Good variety and great value. Don't expect them to last as long as other more expensive bits, these are good for small jobs and they do it well enough. I had to drill a single hole in about 20 small ceramic pots and went through 6 bits in the process.

I purchased these diamond drill bits because I wanted to drill drainage holes in a few of my ceramic pots. These drill bits worked perfectly and I had no issue drilling the drainage holes. The only thing I did was add some water to the pot a few times in order to prevent the ceramic from getting too hot and cracking. I added water two separate times while draining the holes in two of my pots which worked perfectly. I love that these bits came in a wide variety of sizes and I would recommend them.