Specifications 854 4-thread Multifunction overlock sewing machine

1.stitch Length knob

2. presser foot button overlock sewing machine

854 4-Thread Multifunction Overlock Sewing Machine   Stitch Length adjustment knob Changing Presser Foot Button Differential Feed adjustment Lever Detachable work support Bulit-in Accessories Box Seam Width Adjustment Knob Perfect Cover Switch Microswitch   Easy fast looper threading Color coded for threading Snap on presser foot Heavy Duty Cutting System Stitch Function 2,3,4 or 5 Thread Tension release assures accurate thread placement in tension discs Differential feed fro perfect sewing, eliminates puckering or stretching Easy rolled hems Flatlock using 2 thread or 3 thread Gathering Decorative stitch functions with variety of thread combinations Built-in Accessories Box     Adjustable Stitch Width: 3.5-5mm Adjustable Stitch lenth: 1-4mm Presser Lift Height: 4mm Differential Feed Ratio: Min 0.7 Max 2.0 Feed Height: 1mm Sewing Speed: 1200RPM Power: 90W+15W Frequency: 50/60 Hz G.W./N.W.:  9.5/ 7 kgs Meas.: 39.5x36x37.5cm   CE TUV GS ROHS Certificate available