Blades for power saws; Blades for power tools; Drilling machines and parts therefor; Grinding tools for grinding machines; Pads 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; Power drill bits; Power-operated grinding wheels; Sanding pads for power-operated sanders