two HM-equipped cutting edges, face and edge cutting, suitable for milling joint grooves, e.g. dovetails for corner joints or groove joints for longitudinal connections, suitable for all solid woods, wood and panel materials, as well as some plastics, machine and manual feed allowed, to extend tool life we recommend pre-milling with a groove cutter (e.g. 3107), for clean corner joints we recommend using a "splitting wood"