Enlarge and reduce rings in seconds. Polished and plated bronze expanding mandrel has 6 segments and accommodates rings from size 1 to 15. Reducing die has 16 countersunk, carefully formed and finished holes that perform a wide variety of reductions. Will not scratch or mar rings. Overall height is 17" and four holes are provided in the base for securing it to a work bench. Not for use with rings made from stainless steel or platinum.