What does large, medium, and fine mean for saw teeth?
This generally refers to the TPI, or Teeth Per Inch, in straight folding saws. "Large" means less teeth per inch, usually around 6 TPI. Medium usually works out to 7-9 TPI, and Fine has a TPI around 15-18. The less TPI, the more aggressive the cut, which usually means speed. A higher TPI makes finer cuts, not ragged or rough, but takes longer to make the cut.