Norton 05473 4-Inch X 24-Inch 3X P50 Portable Belt, 2-Pack Product Description Premium, self-sharpening zirconia alumina abrasive that has 3 times more performance life and cut than regular aluminum oxide belts. From the Manufacturer Premium, self-sharpening zirconia alumina abrasive that has 3 times more performance life and cut than regular aluminum oxide belts. Features Bi-directional belt splice allows for belts to be run in both directions for maximum sanding life Open coat for reduced loading For high speed sanding and finishing of flat surfaces on wood, plastic and fiberglass USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.