... ton Self-lock trapezoidal screw worm gear screw jack rotating screw detailed informations:1.Model:RN-0.5T,RN- ... RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking trapezoidal screw,heavy duty,precision accuracy ... Coupling, Pillow Block Bearing, Counter, Bevel Gearbox, Swivel Plate and Trunnion Base.Features: * Top End: Top Plate,Clevis End, ...