Icyuma cy'umuyoboro wa C, izwi kandi nka C steel cyangwa C beam, ifite ubuso bw'inyuma bugororotse n'udupira dufite ishusho ya C ku mpande zombi. Iyi miterere itanga ishusho isukuye kandi igororotse, bigatuma byoroha kuyihambira cyangwa kuyisudira ku buso burambuye.Imiyoboro ya CUbusanzwe zikozwe mu buryo bukonje kandi ni nziza cyane mu gushyiramo imiterere yoroheje, purlin, cyangwa gukomeza imiterere aho ubwiza n'imiterere iboneye ari ingenzi.
Icyuma cy'umuyoboro wa UKu rundi ruhande, ifite imiterere yimbitse kandi ifite impande zizengurutse, bigatuma irushaho kurwanya imihindagurikire. Imiterere yayo ya "U" ikwirakwiza neza imizigo kandi ikayigumana ihamye mu gihe cyo gukandamizwa, bigatuma ikoreshwa mu bintu bikomeye nko mu kurinda, ku kiraro, ku miterere y'imashini, no mu nyubako z'ibinyabiziga.