High-speed grinding of metal! Stays sharp longer due to the self-sharpening effect. Removing weld seams from metal workpieces is labor-intensive and time-consuming. When the process can be accelerated, the Prisma fiber disc allows professional users to work significantly more efficiently. With the EXPERT R781 Prisma Ceramic Fiber Disc, you can grind much faster. With the Bosch EXPERT R781 X-LOCK Prisma Ceramic Fiber Disc, you can grind metal much faster than with conventional discs, without having to compromise on quality. This enables professional angle grinder users to work more productively. Faster material removal with Bosch Prisma Ceramic technology.