Those which are U-shaped are called straight shackles, and those which have curved sides are called bow shackles; a bow shackle is weaker than a straight shackle.
Ezo zimilise oko-U zibizwa njengezithi tse kumakhamandela, ezo zinamajiko-jiko emacaleni zibizwa ngekhamandela eligobileyo ayomelelanga njengelithe tse ikhamandela.