The invention is based on an insertable tool having a rotationally drivable, disk-shaped hub (10, 12), on which a grinding means (14) forming a cutoff disk, grinding disk, roughing disk, or abrasive disk is secured in the radially outer region....http://www.google.de/patents/US6902471?utm_source=gb-gplus-sharePatent US6902471 - Heavy-duty tool with a rotationally driven, disk-shaped hub
