Hannun gwiwar digiri 180 nau'in gwiwar hannu ne mai kusurwar digiri 180, galibi ana amfani da shi a cikin tsarin bututun inda ake buƙatar canza alkibla kuma bututun yana buƙatar komawa asalinsa. Saboda babban kusurwar lanƙwasawa, yawanci ana amfani da shi a cikin ƴan lokuta kaɗan.
