Crafted with a high-performance zirconia alumina plus abrasive, Charger R822 coarse grit arbor thread fiberglass flat flap discs last up to 30 percent longer than competing zirconia alumina products and make an excellent choice for blending, deburring, beveling and stock removal. The flat polyester/cotton flaps, designed for use at 0- to 15-degree angles, work great for blending and smooth finishing surfaces such as, titanium and super alloys, soft-carbon and 300 and 400 series stainless steels and cast iron. Backed with the most popular plate configuration available, these type-27 flap discs are super strong, lightweight and absorb vibration.