Measuring rods are solid and assembled on one side of the micrometer head Rods are insulated Hardened and ground anvils Quick-reading figures – every thousandth numbered Each rod marked with length Desired range is obtained by assembling rods and spacing gages to the micrometer head For measuring inside diameters of cylinders and rings, measuring parallel surfaces, and other applications.Includes:(1) 1 in. Head(1) 2 in. Head(4) Measuring RodsCase