The better it is possible to produce parallel drill holes in natural stone quarrying, the less valuable raw material is lost. The basis for this is the 'yoke', which is placed exactly on the rock. One or more profiles with drill hammers are mounted on it. This ensures that all the holes drilled in one operation have exactly the same orientation. All line drilling rigs are equipped with a PLC control system. Drilling depth and hole spacing are programmed in, and the drilling of a boulder is thus controlled fully automatically.