Long life when sanding different materials! The back of the film for a high material removal rate and a great finish Not all grinding wheels are equally suitable for different materials and applications. EXPERT O780 foil already. We have made it versatile, tear-resistant and durable so that you can do various wet and dry grinding tasks without any problems. A single grinding disc that lets you remove the old paint and rust from metal and wood? And also add a great finish to the surface of your workpiece? With the EXPERT O780 Foil you can do all these tasks easily. The disc combines Ceramic Technology â strong, self-sharpening ceramic grains â and our innovative foil back to ensure that you can grind a variety of materials â and again and again. Long life without turbulence thanks to Bosch Ceramic technologyThis text is machine translated.