High Quality Material The ring gauge measuring tool can measure 1-15 US sizes - 3-34 Hong Kong sizes. Made from high quality plastic for long lasting use, you only need to buy one as a jeweler to last you a lifetime. Do you want to surprise your loved one with a ring? Just measure one of their old rings using this measuring kit and buy a ring in the size you want. you indicated on the ring measuring stick. You can also use the high quality plastic measuring rings to measure your fingers and see what ring size would fit them.; US 1-15 and A-Z European diameter - perimeter size. The set includes 1x Ring Measuring Stick, 27 plastic measuring rings of different sizes connected together by a very strong stainless steel cable which can be opened to rearrange or remove/add measuring rings. Easy to use Very easy to use. With the Ring Sizer ring kit, simply slide the plastic ring over the finger to see what ring size is required. With the ring measuring stick, just slide the ring over the stick and read the measurements from the stick.