... hook 2 Cylinder unison feed sewing machine 3 GC1-341 Product DescriptionBig hook cylinder unison feed sewing machineGC1-341 ModelGC1-341Product Photo ... thick material, such as textiles, leather, polyethylene, synthesis, etc.Suitable for sewing bags, sails, tents, bag, coats, leather products, etc.Feature 2 ... 72Lubrication methodsManual note shaft Big hook cylinder unison feed sewing machine GC1-341