Brush Research's BUS314 single row knotted cup brushes are available in a 2.750" diameter. Knotted cup brushes are recommended for removal of burrs, weld scale and rust, edge blending, paint removal and surface prep. Made with 0.014 carbon steel filament, the brush has a 0.875" trim length with a 5/8"-11 arbor hole for attachment to grinding tools.