Norton® FastCut™ 16 Grit Type 27 Silicon Carbide Fiber Disc measuring 4 1/2" X 7/8" has cooling ridges to minimize loading to remain free cutting and last longer. Disc features semi rigid fiber backing with added sharp, coarse silicon carbide abrasive for an interrupted cut to efficiently grind softer materials including marble, granite and concrete. Fiber disc offers to remove any coatings such as adhesives, paint, acrylics, mastics with quick penetration. It is sold as 25 per case.