Gator Finishing 3148 40 Grit Aluminum Oxide Sanding Belts (2 pack), 3" x 21" For use on power belt sanders The Bi-Directional flush joint allows the sanding belt to run smoothly in both directions The resin bonding system resists heat and humidity, extending the life of the sanding belt Made with extreme duty Poly-cotton backing which resists tearing and wear, increasing the life of the sanding belt Best for quick stock and paint removal on extremely rough surfaces 2 pack 3" x 21" 40 grit extra coarse bi-directional sanding belt Use with either a power belt or bench top sander Use for heavy duty sanding and grinding of wood, metal, fiberglass and painted surfaces