Tie Rod for Construction Formwork can control the thickness of the slab wall during the construction process, that is, control the position 

of the formwork to prevent the formwork from contracting inward when erecting the formwork or expanding outward when pouring concrete. 

At the same time, some screws are equipped with a water stop ring in the middle, so it has the function of preventing water seepage from the wall. 

This is an important function of this kind of product, and also the reason why it cannot be replaced.