... two lines of paralled of double chainstitch seam simultaneously! Double Needle Chain Lockstitch Sewing Machinethis model can obtain two lines of ... ,under-wear ,beddings thin package and leather goods.The optional needle gauge has five specifications.what's more,,the model is ... place sewing reniforme sewing of trousers and skirts. technological card needle TV*7 9-21# thread no. 4/2 material thickness ...