1. Use the cutting tool to snip off the end of (or open) a new tube of caulk.
2. Use the thin metal rod to puncture the seal inside a new cylinder of caulk.
3. Put the cylinder of caulk in the caulk gun and use the trigger to pump caulk onto the surface of the project where desired.
4. Applying caulk in this way is called laying a bead of caulk. When the bead is in place, use a damp rag to smooth out the surface of the caulk and bond it to the project