Lid perfected, comprising a top plate and a bottom plate arranged in mutual mounting one above the other, characterized in that each of the upper and lower plates respectively has at its edge at least an annular with an orifice annular semi-circumferentially, said extended annular extensions in a direction substantially perpendicular being the own top and bottom plates and oriented direction of encounter with the bottom or top plate opposite, so that their mutual assembly own annular extensions have coincidence of the axial axes of their respective semi-circumferential annular orifices, capable of passing a single screw conical head.
展开▼
