Bormax® WS prima long with interchangeable centering drill or pilot drill or guide pin, the two offset main cutting edges and the serrated, longitudinally grooved pre-cutters require significantly less feed force and minimize friction as well as the resulting heat generation. Included in the delivery is a matching centering drill and an internal hex key, hexagonal shank for better power transmission, ideally suited for angled drilling in combination with the pilot drills or guide pins 1619 for clean drilling in all softwoods and European hardwoods. For smaller diameters, we recommend our Bormax® WS prima (stake Bormax) with the appropriate extension under order no. 1624+1639.