... Outstanding Features:1. an air over hydraulic, track mounted drilling rig, safer without electricity; 2.Excellent maneuverability, ideal for tight spaces ... notification before it is about to tram.Function Mobile drilling rig, track mountes Roof Support Type secondaryPlant TypeAir-hydraulic Tracked DrillGross ... /minAir Pressure0.4-0.68MpaDrill Diameter25--50mmDrill Depth25mm75m 50mm25m Crawler Rig