I recently got my hands on the 2-1/2" High Performance Diamond Core Bit and let me tell you, it's a real game-changer. This little powerhouse can cut through concrete, granite, quartz, marble, and even terrazzo countertops with ease. It's like a superhero of drill bits. With a 2" depth and 5/8"-11 arbor, it's the perfect size for most jobs. Plus, the included 1/2" chuck adapter makes it super versatile. I was able to use it with my existing drill, no problem. The only reason I didn't give it a fSee full review