Mitutoyo Inside Micrometer with Interchangeable Rods Specifications include... 2" - 8" Measuring Range 0.001" Graduations 0.5" Head Travel Features include... 3 Interchangeable Rods Wide range of ID measurements with interchangeable rods Each interchangeable rod is marked with its measuring range The sizes of interchangeable rods can be adjusted with spacing collars Both micrometer head and furnished rods are satin-chrome finished throughout