60x60mm square galvanized steel sheet piece and 50mm hole in the center.
It is used to put on the board when it wears out in order to put the grid reference
COLMRE_002b , the piece can be nailed to the tablex or glued and thus the hole would be in sheet metal and the plastic piece would fit better.
Technical characteristics:- Material: Galvanized sheet.
- Diameter: 50mm.