Walk-behind and remote control floor grinders rotate large discs loaded with interchangeable abrasive tools (segments) or pads that grind and polish concrete, natural stone, and terrazzo floors. They accept a variety of abrasives for different degrees of material removal, from stripping off coatings to generating a high-sheen finish. Their wide head grinds more surface area than handheld concrete and masonry grinders. A dust skirt on the grinder head forms a barrier that keeps silica dust contained so it can be sucked into a compatible extractor or collector. The grinder's vacuum port connects to the extractor or collector that captures the dust to reduce respiratory hazards from airborne dust and prevent accumulation on floors, surfaces, and tools.