with pre-drill, ideal for drilling at an angle of not 90 ° to the material surface, such as occur in stair construction, for example, can be used with a centering point like the traditional WS-Bormax, with exchangeable centering point or pre-drill, the scope of delivery includes a Staketenbohrmax, a suitable center point, a pilot drill ø 4 mm and an Allen key, 7 pieces in a wooden case ø 15, 20, 25, 30, 35, 40, 50 mm