MITUTOYO IMZ-M 137-011 Extended inside 50-63 mm .

Main Unit for Tubular Inside MicrometerSeries 137This is an extension rod type inside micrometer that offers you the following benefits:<ul><li>Interchangeable extensions with cylindrical gage rods are spring-mounted in protective sleeves so you can extend the measuring range.</li><li>Carbide measuring faces are available.</li></ul>