Engineered from robust zirconia alumina, these flap discs offer extended life and enhanced performance over standard abrasives. The reinforced fiberglass backing effectively reduces vibration for a safer, more efficient grinding experience, even under high heat and pressure. Designed with a 4-1/2-inch diameter and a 7/8-inch arbor, these discs are compatible with angle grinders running at speeds up to 13,300 RPM. They are engineered for diverse applications, including grinding, blending, sanding, and finishing across various materials. Engineered from robust zirconia alumina, these flap discs offer extended life and enhanced performance over standard abrasives. The reinforced fiberglass backing effectively reduces vibration for a safer, more efficient grinding experience, even under high heat and pressure.