The product arrived on time and was as described. I wanted to drill a hole in a granite countertop to install an iSpring water filtration system. It did the job and I was very happy with the result - a clean finished hole. As many explain in YouTube videos, drilling granite takes time. So you have to be patient. But it wasn't that bad in my own experience thanks to the YouTube videos which met my expectations of the project. In general I have no complaints.