Up to 4 times faster than the standard fiber disc. Faster material removal with Bosch Prisma Ceramic technology. With X-LOCK, a single click is all it takes – the fastest accessory change system on the market. Also fits angle grinders with nut and thread. Ideal for grinding metal, for example, to remove thick weld seams from metal constructions. Expert Abrasives - the best for all trades. 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. Bosch Prisma Ceramic features sharp triangular grains that cut more effectively than broken ceramic grains. This highly efficient disc generates less surface heat during use, allowing you to grind longer and faster. Additionally, the self-sharpening effect ensures that the high removal rate is maintained throughout its lifespan. With the Bosch Expert R781 X-LOCK Prisma Ceramic fiber disc, you can grind metal much faster than with conventional discs, without compromising on quality. This enables professional angle grinder users to work more productively.