The second generation of extra heavy duty automatic pattern sewing machine and bar tacking machine-highly specialized electronic control systems, robust construction and sophisticated device for perfect seam quality & maximum productivity; Long sewing cycles by barrel shuttle with large bobbin capacity, even sewing with extremely thick thread; Can easily sew 2-4 ply synthetic webbing slings (3.5mm of each) together or stitch 2 ropes with each of 22 mm(diameter)