This jig allows you to rip thin strips on the left side of the blade, eliminating the danger of pushing narrow strips between the saw and fence. Since the strip is not trapped between the blade and fence, there is also less risk of binding and kickback. It’s simple to use; a single knob locks the jig into the miter track and locks your setting at the same time. Ball bearing guide keeps your workpiece firmly against the fence for perfect repeatability. Use the graduated scale to fine-tune for extremely thin strips. Purchased new but never used as I have medical issues.