With high-performance zirconia alumina plus abrasive, the Blue Fire arbor thread fiberglass conical flap disc offers an aggressive cut and up to 30 percent longer lifespan than competitive zirconia alumina discs. A fiberglass and resin backing combines light weight with high strength, absorbing vibrations and aiding in operator comfort. Made for deburring, blending and removing stock from soft carbon steel and other soft metals, stainless steel and titanium. The polyester and cotton angled flaps offer great surface contact and are ideal for removing stock quickly from contours and edges.