... form of multi-input high reliability Worm Screw Jack:(speed reducer,reducer ,gearbox,gesr units) 1. Model: JF-0 ... precision, Safely self-locking, Heavy duty, Uniform lifting speed, small sizes, easy installation, low noise, long life ... switches, coupling, link shafting. 8. Application: Machinery, metallurgy, construction, irrigation, chemical industry, health care, culture, health and others ...