They are two parts to separate the shell of a SB egg - each half is about 1 1/2" high (red plastic) rings, the egg sits in one that has a metal jaw on each side and the other goes on the top and has a metal pointy thing that pokes into the shell to make the crack. We'd used these since the 50s and I used them until about 10 years ago when two of the metal pieces broke off - and I've been looking ever since, even in antique and thrift shops. The things I've gotten since mainly crush the shells. I know that, supposedly, SB eggs aren't safe to eat, but I still do ... they're comfort food!