Jewelry making tool. Jewelers Ring marking/stamping pliers. Never used!

I bought these from Amazon 2/22 for a jewelry class that I had planned that was later cancelled. I bought them from a third party seller that refused to honor his stated return policy. These have never been used, opened the box only to take a picture of the contents. They’ve been sitting in my drawer for 2 years. It’s is a set of jewelers pliers with pieces that install within to mark jewelry as 925, 14kt, 18kt., etc. I have also attached the Amazon site for further details as I have never used these and don’t know much about them.