Ring Sizer Mandrel: A must-have for anyone with a shop, jewelry business, or DIY ring-making hobby! This handy tool is 265mm long and 12~24mm in diameter, packaged in a compact 27.5x3x3cm size. With 4 types of measuring sizes (American, Hong Kong, Japanese, and European), it's perfect for both in-store and online sales. But hurry, limited stock available - only 1 piece per package!