Red Heat R961 medium grit center mount plastic flat flap discs feature a premium blend of ceramic alumina and zirconia alumina abrasives, making these Type 27 discs highly efficient for medium grit cleaning, detailing, and finishing. The flat polyester/cotton flaps, designed to be used at angles of 0 to 15 degrees, complement your right angle grinder for excellent results on cast iron, soft carbon steels and 400 series stainless steels. The advanced, flexible quick-trim backing plate sets the industry's standard for trimmability, and enhances conformability.