Kumukūʻai ʻeli tricone API IADC216 4 5/8 ʻīniha (118mm)

Hoʻohana nui ʻia ka 4 5/8" TCI tricone bit i ka ʻeli ʻana i ka lua wai, ka ʻimi ʻana, ka lua hoʻāʻo HDD, ka paila kahua, he hoʻolālā lua jet waena kona, no laila hiki ke hana no ka ʻeli ʻana i ke kaʻapuni hoʻohuli.
Ua sila ʻia ka bearing, ʻoi aku ka lōʻihi o ke ola hana ma mua o nā ʻāpana roller bearing hāmama.
He lua waena ko kēia ʻano tricone niho kila i kūpono no ka ʻeli ʻana RC (Reverse Circulation drilling).
Hiki i ka ʻōpuʻu tricone IADC216 ke ʻeli i nā ʻano paʻakikī ma mua o ka IADC126, ʻo ke koho ʻana i ka IADC kūpono e like me ka paʻakikī o nā pōhaku ka hana mua o ka ʻeli ʻana i ka pono kiʻekiʻe. ʻO Far Eastern Drilling kahi hale hana i hōʻoia ʻia e ka API o ka ʻōpuʻu tricone roller.