SN-390 Max. Open: Up to 200mm Rotation: 360 degree Feature ABS grip,metal base with rubber gaskets,very stable. Allows 360 degrees rotation,very convenient to work. 4 different thickness holders: 1.2mm,1.8mm,2.0mm,3.0mm. Max. clamp size up to 200mm,can be adjusted according to different width of the circuit board.