After many experiments, we have succeeded in developing a new rolling wheel that offers some significant advantages. The existing knurling wheels only have one facet at the edges, where they do most of the work. Especially for straight knurls, this shape is not ideal for forming the knurl on the workpiece. A facet acts like a surface that has to push the material for the “teeth” of the knurl forward. In the new BO-shape knurling wheel, the teeth are radiused towards the center of the wheel on both sides.