The adjustable jack base for scaffolding ensures uniform height for the scaffold legs.The base jack can adjust the levels of the scaffolding legs when they are uneven on the surface.   Technical specifications: Material: high-strength steel, hot-dip galvanized surface Adjustment range: 300mm - 700mm (customizable upon request) Chassis size: 150mm x 150mm or 180mm x 180mm (customizable) Thread diameter: 34mm, 38mm, 45mm optional Load capacity: usually more than 1 ton (depending on the specific model)