Which of the following is commonly used as a permanent fixing?

• A. Pop rivet
• B. Velcro strap
• C. Zip tie
• D. Tape

Answer: (A)

Permanence in fixing is about choosing a method that isn’t meant to be easily undone. A pop rivet creates a truly permanent joint. When you fit it, the body of the rivet is expanded from the inside as the tail is pulled, clamping the two pieces together and leaving a solid, single assembly. The tail breaks off during installation, so there’s no simple way to undo the joint without drilling it out or destroying the rivet. That makes it a reliable choice for permanent connections, especially with sheet materials or where you can’t access the back of the joint.

Velcro straps are designed to be opened and re-fastened, so they’re not permanent. Zip ties can hold strongly, but they’re intended as single-use fasteners that are cut when you need to remove them. Tape is typically removable or peelable, so it also doesn’t fit the idea of a permanent fix.

If you need a strong, lasting joint that’s not meant to be taken apart easily, a pop rivet is the natural choice.