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Not sure exactly what your asking, and I don't know Protel.
1st. Hole sizes are usually defined in the datasheet for the parts.
2nd. Hole sizes are defined as finished hole sizes for 2-sided boards.
3rd. You might ask you PCB house what are typical finished hole sizes.
I use Protel 98SE and immagine it to be similar to DXP.
Pad and hole sizes are predefined in the footprints. Once placed, a pad can be changed by right-klicking on it. In the pulldown menu under "Properties" the pads parameters are listed. E
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