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BRASS END BRUSH:Brush
Type: End Brush, meaning the bristles extend from the end of the tool, making it ideal for cleaning, deburring, and polishing in confined or hard-to-reach areas (like small holes or tight corners).
Bristle Material: Brass (or often brass-coated steel wire).
Brass is softer than steel and is used for non-sparking applications, light-duty cleaning, and polishing without scratching softer metals.
WITH 6mm SHANK (5/8"):
Shank Diameter: 6mm (which is approximately 0.236 inches, or slightly less than 1/4 inch).
This is the part that fits into the chuck of your drill or rotary tool.Brush Diameter: 5/8" (which is approximately $15.875$ mm). This is the diameter of the brush head itself.