Measure your own ring size from home! This World Famous Multisizer is widely used in homes and jewelry stores across the country for a quick and easy way determine your ring size! It works just like a belt! Push the end through the buckle to form a ring shape. Slip the multisizer onto your finger. Adjust to give a comfortable fit, checking that it just slips back over the knuckle. When the best fit is achieved, read off the size indicated by the arrow! It is calibrated to measure US ring sizes to the nearest half size.