PHYHOO Ring Sizer Kit Wedding Finger Sizing Measure Gauge Set Jeweler Jewelry Size Tool Ring Loop (purple) Plastic ring sizer set with US Size of 1-13, UK Size A-Z. Ring sizer set come in half sizes, ( "-" Means 1/2 size. "-6" is 6.5, "-7" is 7.5, "-8" is 8.5 etc), no quarter sizes Perfect for fitting wedding rings, class rings and other wide rings. American size:0-13 with size increments are clearly marked on each ring Standard size