... widely used for side seam,decorative seam etc BSL-3800 Series Single/double needle chainstitch sewing machine Feature:1.BSL-3800 ... Parallet 3 needle,.three chainstitch sewing machineparallet 2-needle, needle gauge have 3.2, 4, 4.8, 5.6, 6.4 ... , 8, 9.5, 12.7mm options. BSL-3800 Series Single/double needle chainstitch sewing machine