1-1/2" thru 3" Diameters. Abrasive nylon brushes are excellent for light deburring, edge blending and general surface finishing. Abrasive nylon brushes are safe, non-reactive and offer an excellent alternative to traditional steel filament brushes. The nylon wheel brush has an integral 1/4" shank which makes them ideal for use in automated and CNC equipment Flared design allows finishing on undercuts, shoulders and hard to reach areas.