Stabilizer in bulletin board

This is designed to hold the legs of a bulletin board in place.
M6 screws are inserted into the cylinder.
The body is designed with a diameter of 40 mm and a thickness of 10 mm, and the head of the screw and the screw part are hollowed out.
The head is 14 mm in diameter and 4 mm thick, and the screw part is 6.5 mm in diameter and 10 mm thick.