Zokwerazo zimapangidwa ndi machubu akulu akulu a 3mm, pomwe machubu ena amagwiritsa ntchito makulidwe a 2.5mm, kuwonetsetsa kukhazikika komanso kudalirika pakagwiritsidwe ntchito.
Lingaliro la kamangidwe ka dongosolo la CENTER-BASED likuchokera pakufunika kokonza pansi kokha, kulola kuyika pakati pa malo kapena kolido.Zomangidwa pamashelefu osungiramo zinthu zambiri, zimakulitsa malo osiyanasiyana ophunzitsira komanso kugwiritsa ntchito malo.
