... sewing machine, GB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage, etc Model GB4-1 is ... sewing machine, GB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material.Up-and-down ... head: 78kgNeed bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 PP woven bag sewing machine GB4-1