1/8 x 1/4 blind rivet is a two-piece fastener, typically made of aluminum with a steel pin, that joins materials from one side without needing rear access. The "1/8" refers to its diameter (in inches or millimeters), while "1/4" denotes the maximum thickness of material it can securely fasten, known as the grip length. These pop rivets are used for light-duty tasks, home repairs, and connecting thin materials like sheet metal, plastics, or leather, and resist rust due to their aluminum construction.