5PCS 12mm （8/17 inch） Diamond Hole Saw Diamond Drill Bits for Glass Tile Ceramic (12mm - 5PCS)

You just never know what you are going to get with these 'diamond blade hole saws'. Some barely make it through one piece of tile! This one has done several for me - porcelain at that! - and it works as well as I could expect. Be careful, the design of this cutter makes it prone to 'traveling'. But if you use water, cut at a LOW SPEED (please use a variable-speed drill!), and are mindful of what you are doing, the holes come out just fine!

Was drilling holes in time for a shower door. Had tried carbide tips and it was slow. This was much faster. Couple of tips. Keep a spray bottle of water to cool down the bit as you work. When starting put it at a slight angle until there is a rough spot. Then go flat. Would recommend.

I've used the bit on two different thicknesses of glass, both went really well considering the price of the bits. Would recommend.

With this having no center bit and being on the cheaper side. I was skeptical at 1st but decided to give it a try. I bought the 3-1/8 size diamond edge bit, for drilling a hole in a 4 by 4 inch tile being my kitchen island counter top is tiled with and given the hole was almost the entire tile I was scared it was going to Crack but the bit cut perfectly clean (used water) and worked as advertised. Very happy with the outcome

These bits are durable and leave a clean smooth edge.

I was able to drill a hole right through a granite stone with ease. I used these in a Dewalt drill by hand and also a drill press, both cut right through giving me an inch deep hole in about 20 seconds. If using a drill by hand, start at an angle and slowly turn the drill upright then give it pressure and it'll cut right through. My drill press was able to go straight into it with ease.

Cut a few holes into porcelain with no issues. For the small amount of cuts i needed to make, this was a good economical bit.

Alot better than I anticipated!