Flap discs allow one-step grinding and blending, saving time and cost * Alumina zirconia self-sharpens and provides extended life and more cutting power than aluminum oxide, reducing replacement costs * Strong, Y-weight polyester-cotton backing offers flexibility and supports fast cut on medium to high pressure grinding and finishing applications * Giant disc is extra-thick with 25 percent more abrasive material for even longer life than standard flap discs * Type 29 is shaped with an angled surface suitable for grinding seams and inside corners