Bormax® WS prima long with replaceable centering drill or pilot drill or guide arbor. The two offset fluted main cutting edges and the serrated, longitudinally grooved pre-cutters require significantly less feed force and minimize friction and the resulting heat development, the scope of delivery includes a suitable centring drill and an Allen key, Hexagonal shank for better power transmission, in conjunction with pilot drills or guide pins 1619 ideally suited for angled drilling, clean drilling in all softwoods and European hardwoods, for smaller diameters we recommend our Bormax® WS prima (Staketen-Bormax) with matching extension under order no. 1624+1639