3M Cubitron 3 Fibre Disc, 4-1/2" x 7/8", Center Hole, 36 Grit, 13,300 Max RPM, 1182C (25-Pack)Advantages of 3M Cubitron 3 Fibre Disc 1182C RE ENGINEERED 3M PRECISION SHAPED GRAIN: Uses Re Engineered Precision Shaped Grain, a proprietary technology designed with sharp, angular structures that continuously fracture to form sharp points to wear evenly, run cool, and optimize mineral breakdown A WHOLE NEW CUT LEVEL: Delivers up to 51% faster initial cut rate and up to 61% faster sustained cut rate compared to the 3M Cubitron II Fibre Disc 982C,