Up to 4 times faster than a standard disc. For professional metalworkers, a nice surface finish is very important, but achieving that finish can be a time-consuming task. By minimizing the process steps required for a perfect finish, the Expert N477 disc ensures efficiency without compromising on quality. The Expert N477 Surface Conditioning Material disc is part of Bosch's Surface Structure range of powerful abrasives. It combines the toughness of ceramic-coated aluminum oxide grains with a 3D fleece structure to create a fast-cutting SCM that does not smear. These discs are ideal for leveling scratches left by fiber discs in grain 36 on construction steel, for example. The Expert N477 disc saves professionals time by reducing process steps without sacrificing quality. It is the first choice for professionals when it comes to surface preparation. Easy attachment with Velcro. Disc diameter: 125 mm, hole diameter: 22.00 mm, design: extra coarse.