... the form of multi-input high reliability Worm Screw Jack:(speed reducer,reducer ,gearbox,gesr units) 1. Model: ... : Positioning precision, Safely self-locking, Heavy duty, Uniform lifting speed, small sizes, easy installation, low noise, long life, security ... wheel, reducers, rubber Bellows, steel cover, bevel gearbox, Safety nut, frequency-inverter, brake, trunnion base, limit switches, coupling, link ...