Review on High Performance Diamond Core Bit With 2" Drilling Depth For Granite, Quartz, Soapstone And Concrete Countertops - Vacuum-Brazed With 5/8"-11 Arbor by Matt Welch

I'll be honest, I was skeptical about this little guy when I first saw it. But dang, does it pack a punch! The "Core Crusher" made quick work of my granite countertop project, drilling 2" deep without breaking a sweat. I also love the vacuum-brazed technology - no worrying about losing diamond particles mid-drill. Plus, with the 5/8"-11 arbor, it's versatile enough to tackle different materials. The only reason I didn't give it 5 stars is because it could be a bit more affordable. But hey, you get what you pay for and this thing is worth the investment. Highly recommend.