For heavy-duty oil core barrels, everyone has different special concerns about it, and what we do is to maximize the product requirements of each customer, so the quality of our heavy-duty oil core barrels has been well received by many customers and enjoyed a good reputation in many countries. Roschen Group Limited.heavy-duty oil core barrels have characteristic design & practical performance & competitive price, for more information on the heavy-duty oil core barrels, please feel free to contact us.