Silver Metal Ring Sizer Guage Mandrel Finger Sizing Stick Measure Tool Size 1-13 Perfect use on glass showcases, Grooved on one side to prevent chipped stones The Measuring Stick has sizes 2 to 15 in 1/4 size increments There is on error of size 0.25 between ring and measuring stick, 4 kinds of measurement on the stick. 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.