Review on Diamond-Genround Hollow Ceramic Porcelain by Gabriel Salleh

These things work really well, especially considering how cheap they are. If you go to Home Depot to buy a set of American-made diamond bits like these, it will cost you hundreds of dollars. There's no doubt that these quality bits will last longer than these, but if you're a homeowner like me and only need them for a few things here and there, they're great for you. I have used mine on glass, asbestos siding and concrete blocks and they have worked very well. If you are a contractor or someone who uses them on a daily basis for glass or stone etc I would recommend a high end brand. But overall you get what you pay for, they are worth it.