... the form of multi-input high reliability Worm Screw Jack:(speed reducer,reducer ,gearbox,gesr units) 1. Model: JF-0.5T, 1T ... Characteristic: Positioning precision, Safely self-locking, Heavy duty, Uniform lifting speed, small sizes, easy installation, low noise, long life, security ... to 26 ton (per set) 7. Accessory: Motor, hand wheel, reducers, rubber Bellows, steel cover, bevel gearbox, Safety nut, ...