Yt24&Yt28 Mobile Pneumatic Rock Drill for Stone Quarry Mobile line drilling machine is ideal for quarrying, rock explosion, especially making large diameter holes. (90mm/3.5 inch). It is mainly used for making holes for the passage of diamond wire. And also good for normal line hole drilling, such as holes for expansive mortar. Practicality in use, derived from its simple construction, and the lightness of the structure are its main characteristics. Two control ways to choose, one is feeding by pneumatic motor, cross moving by handwheel.