Astral Granite products are manufactured from quality granite with a high quartz content. This offers superior wear resistance and low porosity, meaning it does not absorb high amounts of moisture. This prevents the rusting of gages, ensuring the smooth movement of gages and fixtures along its surface. The low coefficient of expansion for Astral Granite products ensures dimensional stability. All Astral Granite products have an N.I.S.T. Traceable Calibration Certificate standard.