Norton 49216 5 Inch x 5 Hole 60 Grit Hook and Loop Sanding Disc (Pack of 25) Premium, P-graded aluminum oxide abrasive. Heavy duty backing. Water base zinc stearate, open coat. Last 3X longer than conventional aluminum oxide. Consistent finish. Superior cut rate. Edge tear resistant. Reduced loading. No finish contamination. Quick and easy disc change. Allows for repeated use until disc is worn out. Fits random orbital discs sanders.