... high efficiency,high accuracy,use frequency,self-locking,long life ball screw jack description:1.Model: RNK-0.5T,1T,2T,3T ... scrwe jack feature:high efficiency,high accuracy,use frequency,self-locking,long lifeAccessories: Protective Tube, Rubber Bellows, Electric Motor, Hand ... Clevis End,Threaded End,Plain End and Forked Head.* Single Unit, In Pairs or Multi-Units Arrangement Available.* Anti-backlash ...