The product is a lot of 12 steel plate shim spacers, each measuring 2.25″ x 3.25″ x 1/8″ thick. These unbranded/generic spacers are made of steel and are considered metal plates. They are ideal for use in various industrial and manufacturing applications where precise leveling or spacing is required. The 1/8 inch sheet/flat stock thickness provides durability and stability for a variety of uses within the CNC, metalworking, and manufacturing industries.