... jack lift; Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequentl ... , RN-100 ton.* Safely self locking, Positioning Precision, Heavy Duty, Uniform Lifting Speed, Low Efficiency, Use Infrequently, Easy ... Frequency Inverter,Safety Nut,Steel Cover,Rubber Belllows,Limit Switches,Couplings,Flexible Linking Shaft,Trunnion Base,etc.* Application ...