These coarse sanding discs are ideal for the toughest of jobs including extreme removal of old paint or varnish, as well as projects with a lot of surface roughness The hook and loop backing makes changing sanding discs quick and easy Red resin aluminum oxide grain sands runs cooler and is designed for high speed sanding Aluminum oxide is tough and durable, and is recommended by professionals for sanding a wide variety of materials including wood, metal, fiberglass, and painted surfaces For use with disc, orbital, and DA sanders with hook and loop attachment Resin-bonded to resist heat and humidity to ensure longer life Fits Skill, Bosch, Band, Dewalt, Makita and Milwaukee random orbit sanders 8-hole vented pattern allows for maximum dust collection