SPIRAL FRET SAW BLADES......

This may help you; Basically the lower the number the finer the cut:
 
The difference is that the teeth spiral around the blade in contrast to ordinary blades which have the teeth at the front of the blade.
I have heard that this is not a good alternative to regular saw blades, I use the thinnest blade I could find.
Hope this was what you wanted an answer to, regards-
 
I have used regular saw blade, the narrowest I found in my local hardware, it works very well, since I cut a little outside the lines on the pattern.
 
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