3M™ Purple Clean Sanding Discs – discs that last 2-3 times longer than no-hole, 5-hole or 6-hole discs; fewer and quicker disc changes since disc hole alignment is not required; patented logarithmic spiral-patterned disc with hundreds of holes gives dust a better escape route; high-end, premium grain abrasives for consistent [Read more…] about 3M™ Purple Clean Sanding Discs