New 120 Grit Diamond Pacific Galaxy Wheel. This is a new Diamond Pacific Galaxy wheel. It takes the "grind" out of grinding stones. The galaxy diamond grinding wheel gives you the fast, cool cutting efficiency of diamonds. Galaxy wheels give you lasting service because of their quality construction. The diamonds are held on a heavy steel ring by an extremely hard, nickel alloy plating for durability. The ring is mounted on a tough glass-filled polyester core, making Galaxies a smooth, quiet running wheel. Galaxy diamond wheels are easy to clean. Because the wheels themselves don't wear away as silicon carbide wheels do, you don't get all the mess. You only need a small amount of water to keep the wheels and your stone wet and cool, and to keep down the rock dust. Wheels have a one inch arbor hole. All Galaxy wheels must be used with water. It measures approximately 6" x 1 1/2" (152 x 37 mm).