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We use a high speed drill, with the bits pictured below.
The piece on the left - that's a bolt I had machined because, wouldn't you know it, they don't make the bits ready to use. You need a 1/2" threaded end, and the other end ground to fit a 1/2" drill (those are the only ones with the speed and torque to handle this).
The middle piece is the first bit you use, and this one you cut all the way through the paver. A lot like a core bit, this bit has thicker, heavier sides. But frankly, we use a regular masonry bit for this part.
The bit on the right is the important one. It measures 3" across, and you can see that it has 4 diamond segments at the perimeter, and 4 perpendicular diamond segments extending radially from the middle of the bit. The piece sticking out of the bottom is to guide you into the hole you made with the bit to the left. This bit is very heavy - probably more than a pound - the 1 1/2" shaft is solid.
For the 2 bit set, without the machined bolts, was just under $400, I believe.
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