Tough brush for the angle grinders. Very stiff brush that can remove the most stubborn material with your 4 inch angle grinders. This is a versatile accessory and tool guys love accessories. I was removing rust from an old fire place damper and it was like Rustzilla offering a satisfying domination over the forces of corrosion and gunk. If the wife get the hubby one of these she will have total control over his will power for weeks. Maybe not.