... used to sew canvas, container bags, belts, leather, tent, luggage & thick material. Model GB4-1 is High speed, Single Needle, Compound Feed ... lockstitch sewing machine, FGB4-1 model is used to sew canvas, container bags, belts, leather, tent, luggage & thick material. Up-and ... bar stroke: 58mmShuttle hook: SEIKO HSH-7-3 GB4-1 Canvas Sewing Machine