1.C&Z interchange Roll forming machine 2. Reliable&stable 3. ISOandCE certification. 4. OEM of many companies 5. Fast delive ... We manufacture Roll Forming machine,European roller shutter machine,C & Z purlin machine, ... Material of rollers: GCr15, 9CrSi, quenched2.12 Material of rib roller: GCr15, 40Cr, quenched2.13 Shape of rib: slash rib C&Z interchangeable ...