Bormax® prima with exchangeable pre-drill bit, centre drill bit or guiding pin. Due to the two main cutting edges, which are grooved shifted, as well as the toothed linear grooved pre-cutters, much less feed force is needed. Consequently there is minimized friction and therefore less heat generation. A matching centre drill bit and an allen wrench are included in the delivery. Hexagonal shank for a better power transfer. In combination with the pre-drill bit or the guiding pin 1619 ideally suited for inclined bores. Clean drilling in soft wood, European hard wood, chipboard and MDF. We recommend our Bormax® WS prima (pilot guided) with matching extension for smaller diameters (1624 & 1639). For smaller diameters we recommend our Bormax® WS prima with corresponding extension of our series 1624 & 1639.