Measure your ring size accurately and with ease using these quality metal finger gauges (Japanese sizes 1-30 in one size increments), smoothed and chromed for maximum comfort and durability. All sizes are Japanese sizes, please see the chart below for the equivalent size in different countries world wide.This wide metal ring sizer or finger gauge in Japanese sizes of 1-30 is what you need for getting the precise measurements of your PMC silver rings.Simply select the ring that fits the finger you wish to measure to find the optimal size.Quality made in JapanInchesMillimetersInchesMillimetersUnited StatesCanadaUnited KingdomIrelandAustraliaNew ZealandIndiaChinaJapanSouth AmericaItalySpainNetherlandsSwitzerland0.45811.631.4436.50   0.46611.841.4637.2¼   0.47412.041.4937.8½A  0.48212.241.5138.5¾A½  0.49012.451.5439.11B1 0.49812.651.5639.71¼B½  0.50612.851.5940.41½C 0.50.51413.061.6141.01¾C½ 10.52213.261.6441.72D21.750.53013.461.6742.32¼D½ 2.250.53813.671.6942.92½E330.54613.871.7243.62¾E½ 3.50.55414.071.7444.23F44.250.56214.271.7744.83¼F½54.750.57014.481.7945.53½G 5.50.57814.681.8246.13¾G½660.58614.881.8446.84H76.750.59415.091.8747.44¼H½ 7.50.60215.291.8948.04½I880.61015.491.9248.7