The Norton Hook & Sand aluminum-oxide coated 5" abrasive disc has a hook-and-loop mounting system for quick disc changes and 8 universal vacuum holes for use with a 5- or 8-hole random orbit sander. Abrasive discs with hook-and-loop attachments don't require mounting tools, don't lose adhesion, and stay tightly attached to the sander for quick and easy grit changes during the project. The aluminum oxide grit is one of the most common choices for general purpose grinding of wood, metal, fiberglass, and plastic, and is more durable than silicon carbide grit. The abrasive has been treated with a water-based zinc stearate coating that prevents clogs from forming and can be used in wet sanding applications. The disc has an open coat, which resists clogging and promotes flexibility. Open coat abrasives produce a rougher finish when abrading difficult-to-sand materials because the abrasive grains are spaced farther apart than they are on a closed coat product. The paper backing conforms to contours and delivers a more consistent finish than fiber or cloth backings. The backing is made from A-weight paper, which is the lightest and most flexible of the paper backing options for maximum conformability.