Cov kauj ruam laum, tseem hu ua kauj ruam laum lossis tho txoj kev tho, feem ntau yog siv rau tho daim nyias steel daim hlau tsis pub dhau 3 hli. Ib lub cuab yeej laum tawm tuaj yeem siv cov ntau cov laum. Qhov sib txawv ntawm cov diameters sib txawv tuaj yeem ua raws li qhov xav tau, thiab cov qhov loj tuaj yeem ua tiav tib lub sijhawm. Tsis tas yuav hloov cov laum qhov tawm me me thiab qhov tho qhov muab tso rau qhov.
Xa kev nug