... 60,Φ66,Φ75,Φ76,Φ91,Φ94,Φ1102,single tube drill:Φ36,Φ46,Φ59,Φ75,Φ91,Φ94,Φ110,Φ130,Φ ... 170,Φ2003,rope drillΦ46,Φ47,Φ59,Φ60,Φ754, different or unnormal ... depend on your requirements.we can make our diamond drill to fit all kinds of geological stone.1, ... layer: Alluvial soil layer;Mud ash zone;sandstone;shale;2,middle-hard stone:Fine single limestone;Reinforced concrete;dolostone ...