This part improves dust collection with 5" BOSCH Random Orbital Sanders. It is meant to prevent particles from being ejected away from the sander. It is also meant to increase the airflow speed at the perimeter of the work area to remove a larger number of particles. For good dust control, use wet sanding with a HEPA vacuum. The dust shroud is compatible with the following Bosch random orbital sanders: The dust shroud replaces the sander's Friction Ring 2609170071 (http://www.ereplacementparts.com/friction-ring-p-163180.html). The part must be flexible and resilient to conform to the work surface. Print the shroud using Taulman PCTPE without supports. To install the shroud: