... ,Limestone Quarrying,Marble Quarrying, Mining,including Coal Overburden Excavation, Crawler Mounted SMMEY120 / KY120 down the hole drill rig/DTH ... ,hole depth 25m or more Hole Diameter 80-115mm Crawler mounted down-the-hole drilling rig,ideal for Marble ... re mechanized, self propelled, heavy duty drill rig. Features. • Crawler type undercarriage with track oscillation system • Simple one-man operated ...