Shackle ndi yoyenera kukweza, kukokera, kuyika nangula, kulimbitsa ndi kulumikizana kwina.Shackle yamtundu wa D ndi chingwe chapadera chopangira mphamvu zamagetsi, chokhala ndi voliyumu yaying'ono komanso kulemera kopepuka, kulemera kwakukulu komanso chitetezo chachikulu.