Gator, 2 pack, 3" x 21", 80 grit, aluminum oxide, sanding belts. Designed for heavy-duty sanding & grinding of wood, metal, fiberglass & painted surfaces. For use on power belt sanders. Bi-directional flush joint allows the sanding belt to run smoothly in both directions. Resin bonding system resists heat & humidity, extending the life of the sanding belt. Made of heavy extra weight cloth for maximum strength.