A na-ekewa nchara gburugburu dị ka nke akpọrepu ọkụ, arụrụ arụ na oyi adọtara.Na-ekpo ọkụ akpọrepu gburugburu ígwè bụ 5.5-250 mm n'ogo.N'ime ha: 5.5-25 mm obere nchara gburugburu ka ukwuu na-agbatị ogologo n'ime ngwugwu nke ọkọnọ, nke a na-ejikarị eme ka ogwe aka ike, bolts na akụkụ dị iche iche na-arụ ọrụ;Gburugburu ígwè ibu karịa 25 mm, tumadi eji na mmepụta nke n'ibu akụkụ, enweghị nkebi ígwè ọkpọkọ oghere, wdg.