Premium quality Zirconium grain flap discs are engineered for maximum performance stock removal, blending and finishing. The lightweight fiberglass backing absorbs vibration and makes this product incredibly strong and durable. Pro-line Zirconium flap discs are long life & suitable for a full range of metal applications including stainless steel. Abracs Zirconium Flap Discs discs are manufactured to O.S.A. Safety standards.