... One leveler grooving roller machine Duct manufacture auto-line 4 ( duct machine )Advantages:Line consists of feeding metal frame, leveler grooving ... flange forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing ... available for you,if you want for more details.Add:Building D,299 Tangming Road,Lita Hui,Songjiang District,Shanghai, ...