1.Soild/hollow/U head adjustable base jack. 
2.We can provide all kinds of base jack with high quality at low price
3.Pipe dia: form 30mm to 38mm(solid and hollow)
4.Material: Q235 for welded pipe and 20# for seamless pipe
5.Rigid base plate : 6mm×150mm×150mm, 6mm*140mm*140mm
6.Material: Q235
7.Adjustments from 225mm to 550mm
These adjustable bases give stability to the structure with desired adjustments at the base.