... -50T,RN-100T2.Function: precisely controlled lifting,lowering,pushing,pulling and rolling movements3.Self locking trapezoidal screw,heavy duty,precision accuracy ... , Counter, Bevel Gearbox, Swivel Plate and Trunnion Base.Features: * Top End: Top Plate,Clevis End,Threaded End,Plain End and Forked Head.* Single Unit, In Pairs ...