त्वग्वै ग्रहः स स्पर्शेनातिग्राहेण गृही-तस्त्वचा हि स्पर्शान्वेदयत इत्येतेऽष्टौग्रहा अष्टावतिग्रहाः ॥ ९ ॥
In plain words
The skin is a grasper — seized by touch itself, its own over-grasper. Because it is through the skin that we feel. So these are the eight graspers, and these are the eight over-graspers that hold them.
Close to the Sanskrit
The skin, indeed, is a grasper; it is seized by touch as the over-grasper; for by the skin one perceives touches. These are the eight graspers; eight are the over-graspers.