Knurled adjusting nut allows for final adjustment after the legs have been set to approximate size and the joint has been locked Curved leg is bent to allow the caliper to rest against the workpiece edge Joint design for tension adjustment Caliper opens to approximately 1/3 greater than leg size Hermaphrodite calipers are used to scribe lines parallel to the workpiece edge, locating and testing centers, and other layout ? ? ? ? ?