3/4" Miniature Straight Steel Wire Brush mounted on 3/32" arbor Miniature Steel Wire Brush mounted on 3/32" arbor is used to clean, polish and producing special finishes on metal such as white gold silver and platinum. These straight (.0035") wire brushes are used to achieve a pronounced finish and is used for cleaning, deburring and surface finishing. These have a single section of wire, 3/4" in diameter mounted on a 3/32" mandrel. Sold by the dozen.