Review on Durable Precision Diamond Granite Porcelain Electroplated: Superior Quality for Lasting Shine! by Sean Purnomo

I am restoring a water feature in front of our house and this time I decided to use a stone bubbler. After looking around I decided to try this crown set. Unfortunately I didn't think it through very well because most of the cool looking rocks I plan to use are too thick for me to drill with these bits which can only go about 1 inch deep. I found two relatively flat rocks that would look pretty good when stacked and thought I'd start with those as I have no experience drilling holes in rock. I used a plastic water tub, placed rocks on small blocks of wood (to protect the tub) and drilled a small hole in the cap of a water bottle to use as cooling water. With my drill's lowest speed (about 500 rpm) and a steady flow of water, these bits cut through the rocks (which I think is granite, but I'm not 100% sure) quite well. When I reached the limit of the chisel, I took a few measurements, turned the stone over, and entered from the other side. I didn't hit it exactly, but I got close enough that the connector popped out neatly on both occasions (I'll post a photo of the connectors for reference). I can only recommend them for their excellent value for money!