Ubwoko bwa PEGW lm kuyobora inzira bisobanura umwirondoro muto wa flange imipira yerekana umurongo uyobora, S bivuga umutwaro uciriritse na C bivuga ubushobozi buremereye, A bisobanura bolt kuzamuka hejuru. Igice cyo hasi cyo kugereranya cyashushanyijeho imipira ine yumurongo wibyuma muburyo bwa arc groove ifite ubushobozi bwo gutwara ibintu byinshi mubyerekezo byose, gukomera cyane, kwishyira hamwe, birashobora kugabanya ikosa ryo kwishyiriraho hejuru yubuso, imirongo mike yo kugereranya ikoreshwa cyane mubikoresho bito.