The present article has a distal-end-side member and a proximal-end-side member. The distal-end-side member and the proximal-end-side member are configured to be engageable with each other.
The back view of the present article is omitted since the back view and the front view of the present article are symmetrically depicted. The bottom view of the present article is omitted since the bottom view and the plan view of the present article are the same. The back view of the proximal-end-side member is omitted since the back view and the front view of the proximal-end-side member are symmetrically depicted. The bottom view of the proximal-end-side member is omitted since the bottom view and the plan view of the proximal-end-side member are the same. A dashed-dotted line only indicates a boundary of claimed design and forms no part thereof.