A very simple and accurate ring sizer. When ordering rings, it is vital that you order the correct size. The difference between sizes is just 1mm, but this can make all the difference between a ring fitting comfortably, and being too loose or uncomfortably tight. All our rings are made to measure. We recommend you use a professional measure such as this prior to ordering. Simply push the end through the buckle and slip onto your finger, ensuring that it just slips back off over your knuckle. Read the ring measurement by the indicated arrow. Measures UK ring sizes up to Z.