Heavy materials easily stirred. Two stirring rods for the DUO stirrer, each with three spirals that counter-rotate. The material is kneaded with a combing effect. Less effort for the user|Faster work due to concentrated power. Recommended for heavy, high-viscous materials. For high viscosity or heavy materials needing thorough mixing. for MX 1600/2 DUO, MXP 1602 DUO