I asked this question recently and found the answer while working with
Grizzly customer support on my drill press vibration.
The standard link belts that you see at Rockler, Woodcraft, Tool crib,
etc... are all 1/2", which works great for table saws, bandsaws, and other
larger equipment. But for my poor little 8" drill press, I needed a smaller
link belt. Apparently, Grizzly is the only place I've seen that sells a 3/8"
link belt that will fit my small drill press.
Not sure if this will fit your 12" delta, but it's worth checking out at
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