Flap disc works with a right-angle grinder and is angled to ensure maximum contact with the workpiece * Type 29 angled style is more aggressive than type 27 style and is used for metal fabrication, weld blending, deburring, stock removal, cleaning, stripping, and finishing in one step * Zirconia alumina grit is self-sharpening, more durable than aluminum oxide, and is recommended for heavy grinding of wood, metal, plastic, and fiberglass * Phenolic resin backing keeps disc from scratching the workpiece and offers durability and reinforcement * Threaded hole for attachment to grinding tools