Modular lids (each one is a square) that usually come in pairs or more, so that a rectangle is formed
Each of the squares consists of two triangular parts, with the opening of the lid being done by lifting one of the triangles.
The numbers 1-4 number the different triangles that make up the lid.
FERB - FONDERIE Ezio Rossi BERGAMO
The lid is almost identical to another, and is only different in size Click for cover's details