U-bolt yog tsim los ntawm ob lub voj voog, zoo li tsab ntawv U, nrog cov xov ntawm ob qho kawg uas tuaj yeem ua ke nrog cov txiv ntoo. Vim nws cov duab tshwj xeeb, nws tuaj yeem ruaj ntseg zoo dua cov khoom sib txuas thiab tsis txhob xoob. Cov duab tseem ceeb muaj xws li: semicircle, square, ncaj, daim duab peb sab, oblique daim duab peb sab, thiab lwm yam. Cov khoom siv feem ntau muaj xws li carbon steel, alloy steel, thiab stainless hlau.