3M 9660 SandBlaster 1/4 Sheet 60 Grit Clamp-On Sandpaper 4 Sheets Per Package Designed especially for clip-on high speed 1/4 sheet power tool sanding Ideal for use on many surfaces including wood, metal, and fiberglass Especially developed for coarse sanding or stripping Heavy duty backing is coated with extremely durable Cubitron mineral, which outperforms conventional sandpaper because it stays sharp.