Kits comprised of sandpaper sheets configured to fit power-operated sanders; Abrasive disks for power-operated grinders; Abrasive disks for power-operated sanders; Pads for floor polishing machines; Floor staining and floor polishing machines; Machine parts, namely, polishing discs for floor polishing machines; Polishing discs for automated wet-polishing multi-head machines; Polishing system for use in single-head machines comprising grinding and polishing discs for stone profiling and edges