WS-Staketen-Bormax 2.0 with exchangeable, centering point or pre-drill, such as two offset grooved main cutting edges as well as the serrated, longitudinally grooved spur cutter make significantly less feed force necessary and minimize the friction as well as the resulting heat development, included in the scope of delivery is a Staketen-Bormax, a suitable center point, two pre-drills ø 4 mm and an Allen key and a 250mm extension, hexagonal shank for better power transmission, with pre-drill ideal for drilling at an angle of not 90 ° to the material surface, such as occur in stair construction