Steel Wire Brush Strands .003" X 6" Diameter Straight 2 Row For cleaning and surface finishing on metal. Wire bristles are mounted on seasoned hardwood hubs to fit tapered spindles. All brushes have a 1/4" (6 mm) arbor hole. For cleaning, deburring and surface finishing on silver, aluminum and other white metals. Produces pronounced surface effects. Strands are .003" (.08 mm). Free Shipping!!! Used by Professional Jewelers