Norton 88245 Bench Grinding Wheel Coarse, 6" x 3/4" x 1"Highlights: Grit: Coarse Maximum RPM: 4140 General purpose aluminum oxide bench wheel for metal For use on all bench and pedestal mounted grinders For offhand deburring, sharpening, shaping and limited stock removal on all metals Telescoping plastic bushings allow the wheel to fit most standard arbor sizes Arbor adapter bushings included, sizes: 1 2", 5 8", 3 4" and 7 8"