● Sib sib zog nqus groove pob bearings, dov bearings yog cov qauv neeg sawv cev tshaj plaws, ntau yam kev siv.
● Tsis tshua muaj kev sib txhuam torque, feem ntau haum rau cov ntawv thov kev sib hloov ceev, tsis tshua muaj suab nrov thiab tsis tshua muaj kev co.
● Feem ntau yog siv rau hauv tsheb, hluav taws xob, lwm yam khoom siv ntau yam.