Precision Steel Gauge Block Set Includes a selection of slip gauges for accurate dimensional calibration, inspection, and tool setup. Made from Hardened Alloy Steel Provides excellent wear resistance and long-term dimensional stability, for industrial environments. Conforms to Standards Manufactured with tight tolerances for reliable calibration of meters, calipers, and dial indicators. Mirror-Lapped Surface Finish Each block is polished to a mirror finish for superior wringing and minimal measurement deviation. Protective Storage Case Included Comes in a case for organized storage and safe transport, for labs and toolrooms.