Small Size Single Steel Gauge Block for precision calibration tasks requiring compact dimensions; available individually or as part of a set. High-Accuracy Measuring Standard Manufactured to ISO 3650 standards with tight tolerances, suitable for meter and caliper calibration. Hardened Steel Construction Made from high-carbon steel for excellent wear resistance and long-term dimensional stability. Mirror-Polished Surface Finish Each block is lapped to a mirror finish for superior wringing and minimal deviation during measurement. Flexible Use in Labs or Workshops for metrology labs, toolrooms, and inspection setups; available in various sizes and grades., Manufacturer: SOYWIM