Ivalve yebhola eshushu eshushu luhlobo olutsha lwevalve yebhola.Ineengenelo ezithile ezikhethekileyo kulwakhiwo lwayo, olufana nokungabikho kongquzulwano ekutshintsheni, akukho kunxitywa kunye nokukrazula kwetywina, kunye nokuvula okuncinci kunye netorque yokuvala.Isetyenziswa ikakhulu kwiimeko zokusebenza ezifuna ukunqunyulwa okungqongqo, okufana nesiraphu, itshokolethi, uncamathisele kunye neekhemikhali zemihla ngemihla.