New Graduated Blue Ring Mandrel This is a new graduated blue ring mandrel This is an essential tool for the jeweler, goldsmith, silversmith and metal worker This elegant colored metal ring stick can be used to determine the size of rings Has sizes 1 to 15 in 1/4 size increments by Us standards Also has 1 - 36 & 41 - 76 universal sizes on the back It measures approximately 9 7/8" (250 mm) long Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.