Review on Premium Wet Drill Core Bits For Concrete And Hard Masonry - 10Mm Segment Height, 12" Drilling Depth, 5/8"-11 Arbor - Ideal For Wet Drilling Only by John Eaton

Great well made diamond core bit! I drilled through two 14 inch granite boulders for a fountain and drilled right through them. Just tricked water with a garden hose and i drilled precise holes with ease. Even after drilling through granite, the diamond core drill bit has has a lot of life left. I strongly recommend it and recommend buying the adaptor suitable for your drill. Best part is the bit was just as much as renting it from a big box store!