Solid Scew Jack ismade by threaded threaded bar used  for Construction Frame Scaffolding as well as Australia Kwick Stage System Scaffolding in size of OD30-38mm , Hollow Screw Jack is made by threaded seamless tube is used for Modular Scaffolding System like Cuplock System Scaffold, Ring Lock System, Shoring Frame Scaffoldings, c60 crab system scaffolding. Scaffolding Screw Jack components include thread bar and tube, adjustable jack nut in casted iron or forged and base plate in 120-200mm to level horizon scaffoldings in building.