I used them to cut through a quartzite countertop. It worked great! I used them in my Ryobi 18v cordless drill at low speed with plenty of water flowing over the cut as I worked. the first place. When you start drilling a well, it's almost impossible to be successful without walking around without a suction cup tool. I started the project with a standard diamond drill bit but no tools, but stopped and ordered one to prevent damage from wandering off the drill bit. There's just no good way to reliably and accurately drill into a surface without a clamp like the one that comes with it. With this in mind, suction cup tool bearings will show some corrosion after just one use. At this price point and how seldom I'll be using it, I think it's still good value for money. Just don't expect a tool to last forever.
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