Configure your Thermo Scientific™ Reacti-Therm™ Module to fit your needs with interchangeable Thermo Scientific™ Reacti-Block™ Aluminum Blocks. They are available with many hole configurations and are machine-drilled to accommodate almost any size Thermo Scientific™ Reacti-Vial™ Small Reaction Vial, test tube, or microcentrifuge tube. Constructed of an aluminum alloy for optimal thermal conductivity, these highly efficient units are designed for use with Reacti-Therm Modules, including those equipped with Thermo Scientific™ Reacti-Vap™ Evaporators.