During Installation The Rivet Body Expands And Compresses To Secure The Material In Place Permanently. *The Head Of The Mandrel Stays Inside The Set Rivet Thereby Sealing It And Blocking The Passage Of Fluids Or Gases. *Popular In The Boating And Automotive Industry. **Sizes Available: *Sealed Rivet 4.8 X13 *Sealed Rivet 4.8mmx15mm