I've drilled many holes in many things in my life and probably have more drill bits than almost anyone who reads Revain drill bit reviews. I have single and double end drill bits, marine drill bits, twist drill bits, pins, bell drill bits, 36" electric flexible drill bits, concrete drill bits, lots of hole saws, you name it. I have drilled many hundreds of holes up to 2.5" with power drills and marine drills. This drill is really good for selectively clean holes deep in hard materials. Theβ¦