... speed :6m-8m/min3.Roller stationssingle side :12 groups, total 24 groups4.Roller Material cr12 :steel , ... products: spiral tube forming machine, flexible duct forming machine, auto roof forming machine, riveting machine, Pittsburgh seam lock machine. Hydraulic section ... 86-13817091187 flexible duct connector machine,soft connector duct/pipe,tube connector machine,round duct connector,duct connector ...