... straight stitch, 2step 3step and 4step zigzag, and pneumatic the presser foot lift and pneumatic back tack, needle cooler and hook ... straight stitch, 2step 3step and 4step zigzag, and pneumatic the presser foot lift and pneumatic back tack3. The extra long arm ... parachute repairing. heavy duty thread zigzag sewing machine/ Taiwan roller presser(3.4)