GB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material. ... lockstitch sewing machine, FGB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material. ... -down feed dog and alternating presser foot are adopted in this model. Such a structure ensures that the upper ... : 58mmShuttle hook: SEIKO HSH-7-3 GB4-1 Canvas Sewing Machine