? Fiberglass Conical Flap Disc,Flap Discs ? Constructed with a long-lasting zirconia grain that delivers efficient cutting, the all-purpose Metal R828 coarse grit center mount fiberglass conical flap disc is intended for use with a right angle grinder. Rely on the disc for stock removal, deburring, beveling and blending on a range of metals including, 300 and 400 series stainless, super alloys, cast iron, and soft carbon. To allow for optimal surface contact, the disc features angled polyester and cotton flaps. Lightweight fiberglass and resin backing plates reduce vibration for comfortable use. ? Type 29 conical flap discs with durable zirconia grain provide good cut and life for all-purpose work ? Angled, polyester/cotton flaps provide greater surface contact and are the best choice when speed of job completion and stock removal are primary considerations; may be used on contour and edge work ? Their fiberglass/resin backing plates are the most popular plate configuration due to high strength, light weight, ability to absorb vibration, and operator comfort ? Good choice for coarse grit blending, deburring, and stock removal ? Extra coarse 36 grit for stock removal, beveling and edge chamfering