JJS have USA patent pending for this special plastic cover. (Taiwan patent No. #099205569)
This cover can make easy-screwing.
It has both two sides of covers to screw on/off.
Tel：+886-2-2790-7979 Fax： +886-2-8791-8019 Address：2F., No. 99, Sec. 2, Jiouzong Rd., Neihu Dist., Taipei City 11494 , Taiwan (R.O.C.)
