Ndị isi otu Ninestones bụ ndị mbụ na-etinye aka na nyocha na mmepe nke Dome Insert na China, na-eduga n'ihu mba ụwa.

Na China, otu isi otu Wuhan Ninestones bụ ndị izizi mepụtara PDC DOME INSERT, teknụzụ ya ejirila ọnọdụ ya n'ụwa nọrọ ogologo oge.Ezé PDC DOME mejupụtara ọtụtụ akwa diamond na ọkwa mgbanwe, na-enye nguzogide mmetụta dị elu ma dabara adaba maka iji n'ụdị abrasive.A na-akọ na ndụ nke PDC DOME ezé bụ 5-10 ugboro nke ezé carbide omenala, nke na-ebelata ụgwọ ọrụ ịkụ ala nke ukwuu ma na-eweta mgbanwe mgbanwe na ụlọ ọrụ na-egwupụta mmanụ.

Ezé PDC DOME adabaghị naanị maka nchebe dayameta na mwepu ujo nke ihe nkuchi nke ihe nkuchi nke ihe nkuchi, ihe mgbada ala, na ihe nkedo PDC, mana adọtala nlebara anya zuru ebe niile n'ahịa mba ụwa.Ngwaahịa nha nha PDC DOME nke Wuhan Ninestones bụ ndị ọrụ ụlọ na ndị mba ọzọ ghọtara nke ọma maka arụmọrụ ha dị mma, ịdị mma kwụsiri ike, ọrụ ahịa dị mma, yana ihe ọhụrụ R&D na-aga n'ihu.