This rivet set with a 4X rivet gun can handle rivets up to 1/4 inch in diameter. It allows you to install or fasten rivets in various materials, such as metal or plastic, to create a secure and durable connection between two pieces. The rivet gun provides the necessary force and control to drive the rivet through the material and deform the tail end, creating a tight joint. A 4X rivet gun is commonly used in aircraft maintenance, but also very useful in metal fabrication, and other industries where strong and permanent connections are required.