High-performance tungsten carbide rotary burrs with cross teething. The cross teething provides a higher cutting capacity compared with the simple teething. This particularly has a positive effect on materials which are difficult to cut. Fields of application: for high-alloy steels, non-rusting steels, acid-resistant steels, heat-resistant steels, die casts and plastics. To deburr, break edges, trim, process welding seams, surface processing.