Blind rivets , a.k.a. break stem rivets, are tubular fasteners with a mandrel through the center. Blind rivets are inserted into drilled holes in the parts to be joined, and a special tool is used to draw the mandrel through the body of the rivet . The blind end expands, and the mandrel is snapped off. https://youtu.be/9q6tcONxki4 Specifications: Material: Aluminum Size: 2.4 to 6.4 Technique: Cold Forged Finish : Polish / Plated Quantity Per Pack: 1000 Color : Silver Packaging Type: Box Features: The weldless solution, High retention, side useable, Timer saver, Fast processing Usage/Application: I ndustrial Corrosion Resistance: Yes Fixing Hole Diameter: 0.1 mm Over w.r.t Rivet Shank Diameter Length Range: As per Customer requirement Features: Corrosion resistance High tensile strength Dimensional accuracy Package Includes: 1 x Blind Rivet STSS440