R&M R & M International Corporation K1817 Hand Tools Tin-Plated Cookie Cutters-6 Pcs, Metallic

Are these 4" cookie cutters ? Are they durable ?

What is the size of the hammer?

Which took has the largest dimension and what is it's length?

Do you think the hammer will work to cut through bread? I'd like to make ham and cheese sandwiches for my daughters birthday party.