... 300 to 1600 meters(984 to 5248ft) PRODUCT DESCRIPTIONXGY-300TH Core Drilling Rig is mainly used in geological engineering exploration range ... as well as most types of major workover/drilling tools.With the products exported to U.S, Canada, Cuba, Colombia, Kasakztan ... from Tonghua Petro, you are about to choose the company with highest reputation and longest history of professional oil field/mineral ...