1" Miniature Crimped Brass Wire Brush mounted on 3/32" arbor Miniature Brass Wire Brush mounted on 3/32" arbor is used to clean, polish and producing special finishes on metal such as copper and brass. These crimped (.005") wire brushes are used to achieve a softer or matte finish. These have a double section of wire, 1" in diameter mounted on a 3/32" mandrel. Sold by the dozen.