H&M ABRASIVES-USA Flap Discs are manufactured in accordance with ISO 9001 standard. They are made with premium zirconium aluminum oxide grain for fast stock removal. Broad grit range allows rough grinding to fine finishing. They have heavy deburring and finishing on metal, high performance, High wheel edge stability, long service life, Maximized cutting capacity, Short work time. Low noise, No vibration, None loading.