... ,Φ1102,single tube drill:Φ36,Φ46,Φ59,Φ75,Φ91,Φ94,Φ110,Φ130,Φ170,Φ2003,rope drillΦ46,Φ47,Φ59,Φ60,Φ754 ... , soft layer: Alluvial soil layer;Mud ash zone;sandstone;shale;2,middle-hard stone:Fine single limestone;Reinforced concrete;dolostone;Hard ... granite4, super-hard stone:super-hard granite;high-silicon granite;Quartz spot granite;firestone we are over 20years experience on make ...