Excellent tool
This product is designed to determine the width of the dovetail on the sight, and to measure the dovetail slot as it is cut. It uses round pins, the way machinist measure dovetails, since you can't measure to the corner of the cut any other way. I used it to measure and cut front and rear sight dovetails on a new stainless steel 1911 slide. It worked as expected, it is a third hand to hold the pins against the dovetail while taking measurements.


