The Mitutoyo single rod tubular inside micrometer set features micrometers with carbide-tipped measuring surfaces, a precision-calibrated screw and hardened steel spindle to take highly accurate, high resolution inside dimension measurements. A laser-etched scale on the coated glare-resistant micrometer head, and a convenient locking clamp to hold dimensions in place, helps make reading measurements easier. The zero set on these tubular micrometers easily adjusts with the included key wrench.Available in Metric and Inch setsMetric sets are available with 4 (50-150mm) and 10 (50-300mm) piecesInch sets are available with 4 (2-6″) and 10 (2-12″) piecesIdeal for fast, accurate inside measurements of cylinders, rings and parallel surfacesAdjustable zero-setting helps provide accuracyCarbide measuring surfaces provide better accuracy and wear resistanceScale on thimble and sleeve is laser etched for easier reading in all conditionsTubular inside micrometer sets come in a fitted case