jorgeke Can you give us an idea where these came from . Like country and area. Can you also give us more pictures with something next to them so we can get an idea as to size ?
Those look like handles for cutlery the left is probable a butter knife (can still see the base) the other two are spoon/fork handles most likely. I've found similar items in the river where the thinner metal corrodes first.
I agree that the two similar ones are cutlery, but I think they are the blades. The handle would have been been force-fit over the spike coming out the end and would have come to rest on the ring.