Rivets are 4.8 x 25mm in size, meaning they have a diameter of 4.8 mm and a length of 25 mm. These rivets are used for fastening two or more materials together by creating a permanent, secure joint. Made from metal (often steel or aluminum), these rivets are designed to provide a strong, reliable connection. The rivet consists of a body and a head, with the body being inserted into a pre-drilled hole and then deformed (usually with a rivet tool) to secure the materials together. They are commonly used in metalworking, automotive applications, and various construction projects.