The usual frequencies are 14tpi, 18tpi, 24tpi, and 32tpi.
32tpi is for very hard or thin stuff, 14tpi is for much softer, thicker material - like 1/2" copper. 18tpi would work too. The 14tpi and 18tpi teeth are formed differently than the finer ones, and cut more agressively than just their size would suggest.
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