1.The aluminum cooling blocks provide better temperature uniformity than placing samples directly into a water bath or oil batch. 2.Aluminum cooling blocks can be autoclaved or chemically treated to decrease cross-contamination concerns. 3.Safe for use in ice, dry ice, alcohol, water, oil, liquid Nitrogen and other temperature regulation baths. 4.Cool, freeze, heat, or thaw samples uniformly place blocks directly into a temperature source from -196 degree C to over +100 degree C. 5.Suitable for fast cooling and keep samples at a low temp for preventing degradation during operation. 6.The edge of the cooling block is designed with grooves for easy operation and protection of opeartors and samples.