The metals used on pull saws are designed to have very high tensile strength, for being pulled. So they can be very hard and thin. This gives you a very sharp and thin blade. This thin blade creates a very fine cut width, or kerf. Western style push saws have to be thicker and stand up to the compression of being pushed through material. Pushing a saw can cause flexing of the blade and a loss of control.
The thin hard blade on a Japanese pull saw will allow you to get a very precise, accurate cut with great control. The thin blade also lets you cut fast with less effort than a push style. Having a thin blade gives flexibility in tight corners and hard to reach situations.
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