1. Nhazi ọkwa nke mmanụ mmanụ: H40, J55, K55, N80, L80, C90, T95, P110, q125, V150, wdg.

2. Mpempe nhazi ngwụcha Casing: mkpirisi mkpụmkpụ eriri, ogologo gburugburu eriri, eri trapezoid akụkụ, eri pụrụ iche, wdg.

3. Ejikwa ya maka ịkwado mgbidi ọma na olulu mmiri na mgbe emechara ya iji hụ na arụmọrụ niile dị n'ọdọ mmiri.