Umuyoboro

Icyuma kiringaniye gikozwe mubyuma bya karubone bikomeza gukonja bikonje, umuzi ufite uburebure bwa 5mm, ikibanza gihinduka gikozwe mubyuma bya karuboni 4mm, igikonoshwa ni: icyuma cya karuboni 3mm, igifuniko ni: icyuma cya 2mm, icyuma kinini cya V , yatumijwe mu ntoki n'amacomeka y'intoki, urunigi cyangwa disiki itaziguye, icyicaro ni Fujian Yitai Ke