This 40-grit aluminum oxide flap wheel features an open-coat design that resists loading and supports aggressive stock removal. Its flexible 3 x 1-inch profile and 1/4-inch shank help it follow contours and reach confined areas during sanding, grinding, polishing, and finishing on iron, steel, stainless steel, wood, aluminum, copper, fiberglass, and plastic. **Warning:** This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.