The ProSand H831 coarse grit paper H&L vacuum disc features tough zirconia alumina that sharpens itself during use, making it perfect for blending, stripping, and sanding. Its E-weight paper backing is both flexible and tear-resistant, while the hook and loop design ensures easy disc replacement. With an anti-static coating and open coat, it delivers an aggressive cut on materials like fiberglass, wood, composites, and aluminum.