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Contact Supplier4-Step Calibration Block for thickness and linearity calibration Inch Version: 0.750" square with thicknesses of steps at .250", .500", .750" and 1.000". Metric Versions: Metric 4A (6.25, 12.5, 18.75 and 25 mm) Metric 4B (5.0, 10.0, 15.0 and 20 mm) Step Face: 34" x 34"-Spec: ASTM E797