Belts › Red Aluminum Oxide Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 Red Aluminum Oxide from $2.00 Quality aluminum oxide belts. These are best for high carbon steels and grinding softer materials like wood and composites. Color: 220 Grit 2x72 320 Grit 2x72 400 Grit 2x72 600 Grit 2x72 120 Grit 2x48 220 Grit 2x48 400 Grit 2x48 120 Grit 2x42 220 Grit 2x42 400 Grit 2x42 Add To Cart Added! Quality aluminum oxide belts. These are best for high carbon steels and grinding softer materials like wood and composites.