A disc with a 5mm thickness is a flat, circular object typically used in various applications such as mechanical assemblies, electronics, and industrial processes. The 5mm thickness refers to the measurement from one edge to the opposite edge through the center of the disc. These discs can be made from materials like metal, plastic, or composites, depending on the specific requirements such as strength, durability, or electrical conductivity. They are used for their structural integrity, precise dimensions, and suitability for specific tasks where a flat, circular shape with a 5mm thickness is necessary.