The A290 fine grit paper H&L vacuum disc combines a P-graded aluminum oxide abrasive for outstanding durability and fast cut action with a fiber-reinforced; flexible C-weight latex-saturated backing for strength. The open coat; water-based stearate No-Fil 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 hook and loop back.