1 Big hook 2 Cylinder unison feed sewing machine 3 GC1-341 Product DescriptionBig hook cylinder unison feed sewing machineGC1-341 ModelGC1-341Product Photo Feature 1Sewing medium thick material, such as textiles, leather, polyethylene, synthesis, etc.Suitable for sewing bags, sails, tents, bag, coats, leather products, etc.Feature 2*Connecting rod transfer feeder, good durability, smooth feeding ...