Steel prop is a support system widely used in construction. We can use the tripod as a underprop. There are many kinds of specifications for choosing:

1,Outer tube Ф60 with inner tubeФ48;

Adjustable range:1400~2500,1650~3000,1900~3500.

2,Outer tube Ф75 with inner tubeФ60;

Adjustable range: :1400~2500,1650~3000,1900~3500,2150~4000.

3,Outer tube Ф88.5 with inner tubeФ75.5.

Adjustable range:2900~5500.