... customers2.Working speed :6m-8m/min3.Roller stationssingle side :12 groups, total 24 groups4.Roller Material cr12 :steel ,quench HRC58-62 ... machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing machine. ... -13817091187 flexible duct connector machine,soft connector duct/pipe,tube connector machine,round duct connector,duct connector maker