Lokacin zabar U-bolt bakin karfe mai dacewa, kuna buƙatar la'akari da waɗannan abubuwan:
Hexagon head screws, wanda kuma aka sani da hex screws, hex socket screws, da hex head screws, suna da wani kai mai gefe shida tare da zaren injin da aka riga aka tsara akan shank. An fi gajarta su da HH ko HX.