Norton fibre discs feature a full resin bond system with heavy-duty fibre backing for increased grinding strength, durability, and tear-resistance. They are available in high performance zirconia alumina abrasive grain. A great choice for metal, masonry and wood dimensioning applications. You can grind angles to prepare for welding, grind and finish welds, clean slag from flame cutting, or use to strip paint and quickly dimension wood. Grit size is 80. 5/8-inches Fiber disc arbor.