Choose from 24 Grit, 36 Grit, 60 Grit, 80 Grit, and 120 Grit discs. Max RPM of 13,000 for 4.5″ / 12,200 for 5″ / 8,600 for 7″ discs. We designed these sanding and grinding discs to be easy to get on and off your tool (they require a backing pad).