The Copper Disc Rivet is a high-quality building material made from durable copper. Each disc has a diameter of 1.5mm and a depth of 20mm, making it ideal for various construction projects. This box contains 100 pieces, making it a convenient and cost-effective choice for businesses and industrial applications. With its sturdy construction and reliable material, this product is sure to meet the needs of any project requiring a secure and durable fastening solution.