Brass Wire Brush .003" Strands X 3" 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 and surface finishing brass and other metals. Straight wire produces a coarser finish. Strands are .003" (.08 mm). Free Shipping!!! Used by Professional Jewelers