The anodized reaction block provides a safe and effective solution for replacing existing oil bath and heating mantles. The block simultaneously holds 7 Liu Flasks (3 x 60 mL, 3 x 120 mL, 1 x 250 mL) and 6 vials (40 mL) to perform multi-flask reactions without the use of clamps. The reaction block fits onto the circular top of the hot plate stirrer with a 135 mm diameter. The wells provide space for inserting the thermometer and temperature sensor.