Complete 83-Piece Gauge Block Set Includes a full range of blocks from 1.000 mm to 100 mm, allowing flexible stacking for precise length calibration and dimensional inspection. High-Precision Calibration Standard Manufactured to ISO 3650 standards with accuracy up to ±0.01 mm, for calibrating meters, calipers, and dial indicators. Premium Hardened Steel Construction Made from GCr15 bearing steel with HRC55–62 hardness, offering excellent wear resistance and long-term dimensional stability. Mirror-Lapped Surface Finish Each block is polished to a mirror finish for superior wringing performance and minimal deviation during measurement. for Metrology and Toolrooms for use in inspection labs, machine shops, and quality control environments requiring reliable reference standards.