BQ double tube core barrel assembly -step by step

Jinshi is one leading manufacture in diamond core bit, wireline drill rod and drill accessories in China- WA :0086 15031569148, email: [e-mail], [e-mail]

[@sahendrayadav8002]

Good job sir jee ❤

[@user-sd1km2ew5d]

建议在室内拍摄避免光线影响，增加各配件介绍环节，配合剪辑使用旁白。

[@jinshidrilltech1903]

谢谢指教！

[@manojoraonoraon3181]

Good nice

[@user-ww2uo8xz3k]

唐山金石👍

[@jinshidrilltech1903]

谢谢小卢☺，希望你在国外一切安好啊！

[@samallcott5171]

Nq??!!!!

[@jinshidrilltech1903]

Yes, the double tube core barrels are NQ