When removing unwanted contaminants and stubborn imperfections – or smoothing a rough surface – it’s a good idea to have a load-resistant, sharp-cutting abrasive on hand. Use the 3M™ arbor-mount sanding disc on a straight mandrel for cleaning rust and coatings quickly. Scotch-Brite™ disc has an open web design that is virtually nonloading. Use with No. 4ZR93 mandrel, sold separately.