Flat spiral corrugated duct for post tention
spiral sorrugated duct has two shape, round and flat, both for post tention

metal spiral corrugated duct
metal spiral corrugated duct is mainly for post tension use. we can make diameter from 40mm-160mm, thickness from 0.2mm-0.6mm.

spiral duct machine
Duct machine makes 40mm-160mm prestressed spiral steel duct, with thickness 0.2-0.6mm.

spiral duct machine
Duct machine makes 40mm-160mm prestressed spiral steel duct, with thickness 0.2-0.6mm.