單動雙層巖芯管鉆具結構簡單、操作方便、同軸度好，使用壽命長，能有效地提高巖、礦芯采取率， 保證巖、礦芯的完整度。

The swivel-tube barrel can effectively increase core recovery fatio. It is suitable for drilling in  formations which have oblique holes. It is effective to assure hole quality.

雙管鉆具：國際標準：T2-76、T2-86、T2-101、T6-101、T6-131

雙管鉆具：國內標準： P56、P59、P75、P91、PA-110、PA-130、PA-150

Double tube core barrel:International Standard:T2-76、T2-86、T2-101、T6-101、T6-131

Double tube core barrel:National Standard:P56、P59、P75、P91、PA-110、PA-130、PA-150