1. Shaft e nang le hlooho e otlolohileng, e entsoeng ka tube e le 'ngoe le ea sefahleho se le seng, e ka sebetsoa tlas'a khatello,' me e behiloe ka mochine o le mong.
2. Sebopeho se tloaelehileng ke limithara tse 5, 'me phala e phahameng ea khatello e hahiloe ka pipe e tlaase ea khatello ho matlafatsa polokeho ea basebelisi.
3. Khatello ea phala e hahiloeng ka har'a khatello e phahameng ea khatello ≥72Mpa, khatello e tlaase ea khatello ea lipeipi ≥2.5MPA