Make sure that you get the eye hook into a floor joist or a roof truss. When you purchase them make sure that you tell the clerk how much weight they need to support. Remember steel not galvanized. And you do not need to make the chains too heavy duty. Check the load capacity of the chain and purchase the right one. Get the correct size drill bit, and drill the hole straight.

Then make sure you test the whole setup before you put it into use.

Barton.