As a heavy duty lockstitch sewing machine, GB4-1 model is used to sew canvas, container bags, belts, leather, ... Feed with alternating presser & reverse feed lockstitch machine. As a heavy duty lockstitch sewing machine, GB4-1 model is used to sew canvas, container ... 1400rpm (Clutch motor)Net weight of machine head: 78kgNeed bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 PP woven bag sewing machine GB4-1