B9500-13-02 SET 2-needle / 4-thread overlock machine for light and medium materials with mechanic tape metering device. Efficient, quiet and fast. Now with energy-saving AC Servo motor , control box and power switch integrated into machine head (mechatronics ""all-in-one"" set). AC Servo motor saves up to 70% Energy comparing to a conventional electronic motor or clutch motor. Ensures quiet work without adverse vibration . Efficient tape dispenser Mechanical tape dispenser with adjustable feed s