high speed roofing roll forming machine 1. easy to operate 2. speed is very high,save time 3. automatic, labour saving high speed roofing roll forming machine Rolling speed ... forge steel, coated with chromeShaft diameter85mm, material is 40Cr high quality steelPower of the main reducer11KwPower of feeding motor3Kw (servo ... Tolerance3m+-1.5mmElectric source380V, 50HZ,3 phaseWay of Drive1.2 inch chain