Blind rivets are specialized fasteners designed for applications where the rear side of the joint is inaccessible, hence the term "blind". A blind rivet is a two-piece fastener that includes a rivet body, often called the shell or hat, and a mandrel or stem. These two parts are pre-assembled and ready to use. A unique aspect of blind rivets is their installation process. A hole is drilled in the material, the rivet is seated inside, and a special tool is used to pull the mandrel against the hat. The pressure builds until a designed fault in the mandrel reaches peak force, causing it to snap and leave a properly installed rivet.