Tsim los rau cov khib nyiab tubular hnyav, cov tsheb thauj khoom lag luam, thiab cov khoom siv tsim khoom ruaj khov, peb cov log tsheb 201-907 kg (443-2000 lbs) threaded stem casters muab kev txhawb nqa zoo heev rau cov khoom loj. Txhawm rau tiv thaiv kev puas tsuaj ntawm qia snapping lossis xov stripping thaum hnyav heev, lawv muaj cov qia tuab heev, ua haujlwm hnyav. Ua kom nruj me ntsis hauv qhov loj me ntawm 2 nti thiab siab dua nrog cov treads uas tsis cuam tshuam, tsis muaj cim, lawv ua kom muaj kev txav mus los zoo dua ntawm cov plag tsev tsis zoo thiab muaj cov kev xaiv xauv txhim khu kev qha. Tsis pom qhov koj xav tau? Tiv tauj peb kom tau kev taw qhia.
