screw car lift features:1.Model:RN-0.5T,RN-1T,RN-2T,RN-3T,RN-5T,RN-10T,RN-15T,RN-20T,RN-30T,RN-40T,RN-50T,RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking trapezoidal screw,heavy duty,precision accuracy,low efficiency,use infrequently4.Arrangement: single units,in pairs or multiple..