Gator 2PK 4" x 24" 120 Grit Aluminum Oxide Sanding Belts are designed for heavy duty sanding and grinding of wood, metal, fiberglass and painted surfaces. They are made of heavy extra weight cloth for maximum strength and have a resin bonding system that resists heat and humidity, extending the life of the sanding belt. The bi-directional flush joint allows the sanding belt to run smoothly in both directions. For use on power belt sanders.