Screck Thread vials da iyakoki suna ba da ƙarancin ƙazanta, raunin ƙasa lokacin ɗaukar kaya fiye da hatim ɗin da ba za su buƙaci kayan aiki na musamman ba. Dukkanin dunƙulen dunƙule da launuka sun bambanta da zaren zaren kamar yadda Cibiyar Wabarin Gilashin, GPI. Don dunƙule bakin vials, an sanya lambar kashi biyu. Misali, kusan wuya 8-425 yana wakiltar vial tare da diamita na 8 mm a waje na zaren da kuma salon zaren 425.