... 4.easy to operate Coring, Taking Samples, Geology Exploration! HF200 Hydraulic Core Drilling Machine 1,Drilling depth can ... water well, bore holes, coring, taking samples, geological exploration, exploration of high building construction, rivers construction, civil water well ... caliber30mmTriangle conveyer beltB1728mm Coring, Taking Samples, Geology Exploration! HF200 Hydraulic Core Drilling Machine