Works like a belt. Turn and push end through to form ring shape. Slip onto finger. Adjust to a comfortable fit that slips over knuckles without difficulty. Read the indicated size after determining the best fit. Can be reused as many times as needed!
Please keep in mind the Gauge measures 5mm wide. If the ring you are looking to order is wider we recommend you do not pull the gauge tight as this will make a wider ring feel too small. The wider the band the tighter it will feel on your hand. Also it is best to measure your finger at the end of the day. Finally your ring size in the dead of a freezing cold winter will be different than the hottest most humid day in the summer so you may need to account for that.