THE WORKHORSE OF ABRASIVES ALUMINUM OXIDE IS COMMONLY USED ON SOFT AND HARD WOODS NONFERROUS METALS SUCH AS ALUMINUM AND CERTAIN STEELS. KEEP A SUPPLY OF EXTRA BELTS ON HAND. WORN TORN OR SCRATCHED BELTS CAN IMPACT THE QUALITY OF YOUR RESULTS AND SHOULD BE REPLACED. INCLUDES 36-GRIT AND 50-GRIT ALUMINUM OXIDE BELTS AND A 180-GRIT ZIRCONIUM BELT.