Configure your Thermo Scientific™ Reacti-Therm™ heating and stirring module with these interchangeable Thermo Scientific™ Reacti-Block™ aluminum blocks. They are available in a variety of hole configurations to fit almost any size Thermo Scientific™ Reacti-Vial™ small reaction tube, test tube or microcentrifuge tube. Reacti-Blocks are made of aluminum alloy for optimal thermal conductivity and include a thermometer well. Many blocks are suitable for use with the Thermo Scientific™ Reacti-Vap™ Evaporator.