Abstract: A device for applying the drill tool displaceably carried by the feed beam of a vehicle supported drilling machine to a rock surface located at a distance from the feed beam. The drill tool is held in position during the collaring of the drill hole by a drill guide carried by a maneuverable arm mounted on the vehicle separately from the feed beam, and which drill guide is moved into engagement with the drill tool in close proximity to the rock surface. After the drill tool has penetrated into the rock surface a distance sufficient to be supported by the drill hole, the drill guide is released by a hydraulic device and withdrawn from the drill tool by the maneuverable arms.