Model GB4-1 is heavy duty lockstitch sewing machine used to sew canvas, container bags, belts, leather, tent, luggage, etc. Model GB4 ... reverse feed lockstitch machine. As a heavy duty lockstitch sewing machine, GB4-1 model is used to sew canvas, container bags, belts, leather ... (Clutch motor)Net weight of machine head: 78kgNeed bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 GB4-1 Container bag sewing ...