... small volume, high efficiency 4.wide power range, low noise Screw JackSpecifications:1. Model: JF-0.5T, 1T, 2T, ... gear, bearing housing and lead screw 3. Function: Elevating, Lowering, Pulling, Pressing, Pushing, Rotating 4. Power Source: Manually or ... screw jack, worm screw jack, ball screw jack, lift, planetary speed reducer, worm gear reducer, helical geared motor, spiral bevel gear unit, parallel ...