Check the listing for details. Pneumatic Disc Sander Grinder Machine with Controller 7000 RPM, Industrial Sande. Condition: New. Listed at 298.00 USD. Model Type: Pneumatic Disc Sander/Grinder/Polisher. No-load Speed: 1-7000 RPM (Adjustable). Industrial Power: 550W motor for heavy-duty sanding, grinding, and polishing. 1 x Main Machine Unit. Multi-Functional: Compatible with sanding discs, polishing pads, and buffing wheels.