Efanr Ring Mandrel Sizer Finger Sizing Measuring Stick Metal - US Size 1-15 with Ring Sizer Guage Set of 31 Pcs Circle Models Jewelers Tool Equipment Silver There are 4 kinds of measurement on the stick , 1-15 is American type Great for Jewellers, Ring Makers, Hobbyists, Craftsman etc Great for use on glass showcases Grooved on one side to prevent chipped stones There is no relation between the size of the ring and the size of the stick. The rings are used to test the size of your finger, while the size on the stick is your ring size.