... bags, belts, leather, tent, luggage, etc Model GB4-1 is High speed, Single Needle, Compound Feed with alternating presser & reverse feed ... speed of the main shaft and reduces noise, ensuring the quality of the whole machine and prolonging service life. Oversize oscillating ... head: 78kgNeed bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 PP woven bag sewing machine GB4-1