Aluminum Foil Flexible Duct Machine email/msn: may(at) skype: mayxie83 Main Technical Data: Raw Material Thickness -0.055-0.15mm Raw Material Width - 40-80mm Diameter - 80-500mm Compression Ratio -1:3 Lock way –4 decked tabby locking. Products dimension: surface corrugations 7 corrugations: 40mm product length: 38-158mm 7surface corrugations: 50mm product length: 50-250mm 9 surface corrugations: 60mm product length: 60-300mm 9surface corrugations: 80mm product length: 100-500mm((Optional)