Diamond hole saws are ideal for cutting concrete countertops for faucets. By attaching a centering pin to the bit, holes can be precisely located. They are removed once the bit starts coring into the concrete. The coring process doesn’t stress the surrounding concrete, so the possibility of cracking is minimal. An 18-V drill/driver is all that’s needed to provide the power. Bosch Power Tool Corp. 877-267-2499. www.boschtools.com