Product Description SWL series skillful manufacture screw reducer:  1.Convenient to adjust2.Wide range of ratio3.Easy to install4.high torque Application Industries:Our SWL series screw jacks are widely used in the industries such as metallurgy,mining,hoisting and transportation, electrical power,energy source,constrction and building material,light industry and traffice industry  Product Parameters Type Model Screw thread size Max lifting strength kN … Continue reading China Hot selling Swl Trapezoidal Ball Mechanical Lift Elevator Hydraulic Worm Bevel Gear Screw Jack Gearbox for Construction Jump Form Scaffolding System Lifting Formwork components of gearbox