Suitable for sewing extra heavy materials such as sails,shoes,awnings, sofa,upholstery,funiture,laggage and favrics,leather,canv Heay Thread Zigzag Sewung Machine large shuttle hook and large bobbin capacity promises high efficiency in sewing machine 1.Extreme thickness of thread used by machine ensures strong seam 2. Adopt link take up and bottom feed system 3. large shuttle hook and large ...