Dremel 84922 silicon carbide stone
84922 is the narrower 3/16-inch silicon carbide stone in the documented family.

How to choose
Compare the head width if you need to reach a small area on a listed workpiece. The larger 85422 uses the same abrasive family but requires more room around the working head.
Compatibility and limits
3/16-inch silicon carbide head · two mounted stones
Care
Before mounting the accessory, check its speed rating against the tool and use the holder specified for its shank or mandrel. Refer to the exact model instructions for the workpiece.
Questions before buying
Is this the smaller option within the silicon carbide stones?
Compare the head size with the 85422. The narrow 84922 can fit a smaller working area, while the 85422 offers a broader contact on a suitable surface.