Holder for rings. To my question, why do you need this, because you have a vice?
I was told that the vice is not always convenient to use. There are jobs for which it is quite enough to put a ring on the mandrel. A mandrel "put" on the table. So this oddity was born. The ring-mandrels are manufactured by a lathe. The material is duralumin. As a shaped stand, spare parts from old wall lamps.
