GB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material. Model GB4- ... lockstitch sewing machine, FGB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material. Up-and ... machine head: 78kgNeed bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 GB4-1 Canvas Sewing Machine