If you’re the type of person who needs constant reassurance of the circumference of your wrist, or if you want to flaunt your geometric prowess or love of quantifiable length, then this is the perfect bracelet for you. This 1/2-inch wide stainless steel bracelet is available in either Imperial (shown) or metric (which would also be 13mm wide) versions. Since conversions between Imperial units are so difficult to do without computation aids, the Imperial version has the added benefit of being a conversion tool. Cool!