... used to sew canvas, container bags, belts, leather, tent, luggage, etc Model GB4-1 is High speed, Single Needle, ... machine, GB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material ... the main shaft and reduces noise, ensuring the quality of the whole machine and prolonging service life. ... stroke: 58mmShuttle hook: SEIKO HSH-7-3 PP woven bag sewing machine GB4-1