Gator 2-Pack 3" x 18" 50 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 bi-directional flush joint that 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. Gator Aluminum oxide sanding belts are designed to fit the most popular portable belt sanders offered today.