Qhov muag bolts yog ntau yam hom fastener dav siv nyob rau hauv ntau yam lag luam, nrog rau kev tsim kho, kev thauj mus los, thiab kev tsim khoom. Cov bolts no paub txog lawv qhov kawg looped, uas ua rau lawv yooj yim txuas los yog ruaj ntseg nrog chains, hlua, los yog cables. Nrog kev xav tau ntau ntxiv rau ey...
Nyeem ntxiv