Dremel 536-02 brass wheel brush
1/2-inch 536-02 brass brush model.

How to choose
Compare the documented brush material and profile with the surface and access you have. A wheel of the same diameter can use a different wire material.
Compatibility and limits
Half-inch brass cup brushes · two mounted heads
Care
Use the brush tips with light pressure and check the speed limit printed for the exact brush. Dremel’s cleaning guide explains how pressure affects the working bristles.
Questions before buying
When would I choose the 536 cup over the 537 end brush?
Use the cup when you can reach the surface with its wider face. The 537 has a narrower brass end that is easier to compare for a groove or recessed detail.