P D Check Thread Wire Attachment System;

As easy as selecting the proper wire sizes, matching the wire size with the proper P.D. Check, slipping two wires into the holder, placing the holder on the micrometer handle, holding the micrometer in one hand and the third wire in the other, and checking the threads. An accurate and inexpensive way to check threads. Makes thread triangles, thread Micrometers and all other current methods obsolete.