Ua kom yooj yim rau kev sib dhos ntawm koj cov rooj npaj khoom siv hlau tsis xeb thiab cov tsheb thauj khoom siv tubular nrog peb 2 Nti Bolt Hole Casters. Qhov kev tsim kho hollow kingpin nruab nrab no haum rau cov bolts ntev rau kev teeb tsa ncaj qha rau hauv cov yeeb nkab hlau puag ncig lossis plaub fab. Tsis pom qhov koj xav tau? Tiv tauj peb kom tau txais kev taw qhia.
