... : 100~1000mm 3. hydraulic type 4. economic hydraulic elbow making machine,gorelocker,spiral duct machinery,is for making duct elbows, max ... . thickness 1.2mm, max dia 1000mm.Hydraulic elbow making machine,gore locker,spiral tube former 3.1 Max. thickness of ... .7 Weight: 750kg spiral duct machinery, gorelocker, hdyraulic elbow making machine. hydraulic elbow making ...