The A290 fine grit paper hookandloop vacuum disc combines a Pgraded aluminum oxide abrasive for outstanding durability and fast cut action with a fiberreinforced, flexible Cweight latexsaturated backing for strength The open coat, waterbased stearate nofil coating and vacuum holes help resist loading to ensure durability Select the A290 vacuum disc for fine grit dry sanding and finishing applications involving aluminum, composites, fiberglass and wood For convenient installation and removal, the disc features a hookandloop back