a clip - on finger strip including a common base having a predetermined width and length ; and a plurality of fingers each having a supporting unit which is connected by placing a first connecting part at one end of the common base and is prolonged to the other end of the common base , an escape preventing unit which is prolonged to the supporting unit , an elastic contact part which is connected by placing a second connecting part at one end of the common base and is prolonged to the other end of the common base , and a height maintaining unit which is prolonged to the elastic contact part , which prevents the transformation of the finger strip even if the module mounting the above finger strip is frequently inserted / drawn out into / from the sub rack and enhances shielding effect between the modules by maintaining a proper height .