If you ever want to take your baby hammock or cradle out of the home, a door frame clamp is a good item to have. It might turn out that your baby likes the hammock or cradle so much that you want to take it with you when meeting with friends or visiting grandparents. If that is the case, you will need to have the door frame clamp. , , Included: 1 Door clamp & 1 Safety snap hook with plastic.