Ingersoll Rand G4621 IQV20 Cordless Polisher Sander, 8300 RPM, Brushless Motor, 2" & 3" Pad Compatible. G4621 Polisher/Sander. Part Number: G4621. The Ingersoll Rand G4621 may also be referred to as a cordless mini polisher, battery-powered sanding tool, 20V polishing sander, Roloc polisher, or compact automotive polishing tool.