The better it is possible to produce parallel drill holes in the natural stone extraction, 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 are mounted on it with rotary hammers. This ensures that all drill holes in a process have exactly the same orientation. All row drilling rigs are equipped with a PLC control. The drilling depth and hole spacing are programmed in, and drilling into a boulder is thus regulated fully automatically.