Osborn - Knot Wire End Brush, Brush Dia.=3/4", Overall Length=2-3/4", Fill Dia.=.0104, Max RPM=20,000, Rugged brushing tools designed with the finest wire to offer efficient usage for a wide variety of cleaning and maintenance applications; can be used on CNC machines.  Applications: spot cleaning or facing, removal of slag, rust or scale, cleaning pipe I.D., deburring or flash removal, cleaning of dies, molds and tooling, pipeline cleaning.  Carbide Steel material.