Rope and Nail is an item set that is strictly used for building hammocks. They serve no other purpose. Rope and Nail can only be placed on any side of block.

The recipe is strings in the top left, top, left, and bottom right slots, and one iron ingot in the center.

In order to build a hammock, you need a piece of hammock cloth. The recipe for one is illustrated above. You will also need two sets of Rope and Nail. Now, you need to find some blocks that are exactly four spaces apart

Once you've found a suitable location, place the two sets of Rope and Nail on the sides so that they're facing each other.

Now grab your hammock cloth and right click either one of the Rope and Nail.

And voila! You're ready to take some quality naps even when it's bright and sunny outside.