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SPEX SamplePrep Freezer/Mills® are cryogenic laboratory mills that cool samples to cryogenic temperatures, and pulverize them by magnetically shuttling a steel impactor back and forth against two stationary end plugs. Since the vial is closed, the integrity of its contents is maintained: hazardous or critical samples are easily controlled, cleanup is simplified, and cross-sample contamination is eliminated. Because the grinding coil is immersed in liquid nitrogen throughout the grinding cycle, the sample is kept at cryogenic temperatures and its key aspects are preserved. These features have made SPEX SamplePrep Freezer/Mills the most effective cryogenic mills in the world. They are the “mills of last resort” for many normally ungrindable samples, or samples whose composition or structure is altered by the heat generated by conventional grinding.