I-elbow yendlela-ntathu luhlobo lokufakelwa kombhobho osetyenziselwa ukwahlula umbhobho kwimibhobho emibini okanye ukudibanisa imibhobho emibini ibe yinto enye.Ineentlobo ezininzi ezahlukeneyo zeefom, ezifana nee tee ezilinganayo ze-diameter, ukunciphisa ii tee, njl.
