The Mitutoyo 511-803 micrometer head bore gage and interchangeable anvils greatly expand the gage’s measurement range with high accuracy. The Mitutoyo bore gage with a micrometer head (no indicator) delivers a wide range of bore measurement capabilities at high accuracy to 2µm. Interchangeable anvils constructed of alloy steel attach to the micrometer head for accurate dimensional setting. The anvils feature a carbide-tipped ball for better measurement reliability and longevity. SPECIFICATIONS ● Range: 60-100mm● Accuracy: 2µm● Graduations: No Indicator Included● Stem Diameter: 8mm● Micrometer Head Travel: 10mm● Sub Anvils: 10mm & 20mm FEATURES ● Does not include a Mitutoyo Dial Indicator● Inch models have a graduation option of 0.0005″ and 0.0001″● Optional extension rods are available to measure deeper bores and holes● Large, newly designed hollow grips are easier to hold and reduce heat transfer from the operator for better accuracy● Models with dial indicators are fully protected by a rugged cover● Interchangeable anvils are constructed of alloy steel with carbide-tipped measuring faces for added accuracy and durability● Includes various anvils and spacers depending on the size of the gage ordered● Supplied in a fitted plastic case