Ans: Usually, a bench grinder has two wheels to increase the tool’s versatility. Here the grinder with one grinding/sanding wheel having a light-medium grit is used for light sanding tasks, whereas the other grinding/sanding wheel having a medium-coarse grit is used for tougher grinding works. However, there are various wheels available for these tools, of which some are specialized. You can switch to use one or both of these wheels for a coarser or finer grit, a buffing wheel for polishing, a wire wheel for cleaning or shaping metal, a cutting wheel for metal or wood cutting, specialized wheels for cutting or grinding stone and a specialized wheel for cutting gemstones.