Enduro-Flex one-step finishing discs surpass the challenges that the metal fabricating and finishing industry faces on a daily basis. With ultra sharp and refined zirconium grain, the Enduro-Flex finishing disc will stay sharper for a longer time while removing more material faster. A special top coat continuously cools and lubricates the disc for smooth, vibration-free grinding and sanding from start to finish. There is no need to discard the disc when the flap overhang is worn down to the backing because the Enduro-Flex disc can be restored to like-new performance by reducing the diameter of the Eco-Trim backing. Always use with flange WAL30B057. For use with steel and stainless steel. Package of 10. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.