Qhov rooj thiab qhov rais kho vajtse yog ib lo lus sib sau ua ke rau ntau yam hlau fittings ntsia ntawm lub qhov rooj thiab qhov rais, suav nrog cov khoom tseem ceeb xws li qhov rooj kaw, iav qhov rooj clamps, pulleys, crescent locks, handles, thiab qhov rais locks. Cov thawj pawg npog qhov qhib thiab sib txuas-xws li qhov rooj thiab qhov rais nyob twj ywm, pob khawm, kev sib txhuam nyob twj ywm, coj txoj hlua, thiab lub qhov rooj xauv- nrog rau cov cuab yeej pabcuam xws li kab hlau rhuav, bolts, thiab qhov rais latches. Lawv cov dej num cuam tshuam txog kev tswj lub qhov rooj thiab qhov rais ua haujlwm, txhim kho cov qauv, thiab kev tiv thaiv kev ruaj ntseg.
Nyob ntawm lawv daim ntawv thov tshwj xeeb, cov khoom siv kho vajtse no tuaj yeem hloov kho rau ntau hom qhov rooj thiab qhov rais- xws li cov qhov rooj zawv zawg thiab cov qhov rais qhov rooj -nrog cov qhov rooj zawv zawg, tshwj xeeb, yuav tsum tau tshwj xeeb cov lus qhia kom ua kom muaj kev txav mus los.
