I-Drill String Ukubamba Amathuluzi

Amathuluzi okuphatha adlala indima ebalulekile ekusebenzeni kweyunithi yesimanje yokubhola. Asetshenziselwa ukumisa, ukuhambisa, nokuzungeza amashubhu ngaphakathi naseduze nendawo yomthombo kanye nasendaweni yokubhoboza.