This economy solid steel mandrel is for making round shapes such as bezels, jump rings, etc. It has a ground, polished surface that is heat treated. The steel is strong enough to withstand the blows from a hammer.
This round bezel mandrel tapers from 15/16" (11.5mm) in diameter down to 3/16" (4.5mm) at the tip.
Overall length of the mandrel is approximately 10-7/8"