Milwaukee® Bumper is designed for grinders, heavy-duty polishers, sanders, lightweight sanders, D.I. 6000 RPM dial speed sander, D.I. 6000 RPM lightweight sander, 2", 50 mm die grinder, 3", 5", 125 mm straight grinder, 7" heavy-duty polishers, 7" heavy-duty speed control polisher, 9" sander, 7" and 9" 5000 RPM 2.25 max hp sanders and 7" and 9" 0 - 6000 RPM 2.25 hp sander.