I-U-bolt yibholithi ebumba unobumba u-U kunye nentambo yesikali kwiziphelo zombini. Icarbon iron U bolt ngokucacileyo ichaza ukuba impahla ye-bolt ye-U yintsimbi yekhabhoni.
Ibhalbhu yensimbi ye-Carbon isetyenziselwe ikakhulu ukuxhasa ipayework, imibhobho apho kudlula khona ulwelo kunye neglus. Kananjalo, iibhelts zensimbi yekhabhoni zilinganiswe kusetyenziswa ubunjineli obusebenza. Ibarbon iron U-bolt iyakuchazwa ngosayizi wombhobho owawuxhasa. I-U-bolt yensimbi yekharbon ikwasetyenziselwa ukubamba iintambo kunye.